Step 1
Diagnose which units are actually at risk
Take a short diagnostic. Sia returns an AP score range and shows which of the 8 units are losing you marks, rather than which ones feel hard.
AI AP Bio tutor · Mac & Windows
The AI AP Bio tutor that tells you
The AI AP Bio tutor that tells you
exactly what to study today.
Set your target AP score. Sia plans every day between now and Monday 3 May 2027, weighted by what each unit is actually worth on the exam, with rubric-level marking on every free response.
Download free
Mac & Windows · free, no credit card
Start for free
Create a free account, no credit card
2M+ students
Weighted by unit exam value
Rubric-level FRQ marking
Free tier, no credit card
Set your target in 30 seconds
Live score forecast
Build your AP Bio prep path
Move the sliders. Sia forecasts the gain and maps the days to 3 May 2027.
Your score gap
Where you are
Where you're going
Sia forecast
—
days to the exam
Monday 3 May 2027, Session 2
—Units to cover before exam day
—Total study hours at this rate
—Experimental-design FRQs
This is a projection from typical progress at your starting band, not a promise. Inside the app, Sia rebuilds it from your real diagnostic after every session.
Realistic with consistent prep
Download on Mac and Windows, or sign up and start in your browser. Your plan is built in about 3 minutes.
AP Biology at a glance
Last reviewed
The AP Biology® exam is on Monday 3 May 2027, Session 2. It runs 3 hr and is a hybrid digital exam sat in Bluebook®. Section I is 60 multiple-choice questions, 90 minutes, 50% of the score, and Section II is 6 free-response questions, 90 minutes, 50% of the score. It is scored 1 to 5.
3 hr
Total testing time
60 MCQ
90 minutes, 50% of the score
6 FRQ
90 minutes, 50% of the score
1 to 5
AP score scale, no penalty for wrong answers
Hybrid Digital
How the exam is administered in Bluebook
Session 2
Monday 3 May 2027
Four-function, scientific or graphing calculator permitted. A formula sheet is provided. Every exam fact on this page is taken from College Board's official published course and exam materials. AskSia is an independent study tool and is not affiliated with or endorsed by the College Board. Confirm details on the official AP Students site before exam day. Spotted something out of date? Tell us and we will correct it.
Where the marks actually are
AP Biology unit weights, and what that means for your plan.
Unit 7 is the heaviest single unit and it sits at the end of the syllabus, which is exactly where classes run short of time. Units 3 and 6 are close behind.
Unit 1: Chemistry of life
8-11%Unit 2: Cells
10-13%Unit 3: Cellular energetics
12-16%Unit 4: Cell communication and cell cycle
10-15%Unit 5: Heredity
8-11%Unit 6: Gene expression and regulation
12-16%Unit 7: Natural selection
13-20%Unit 8: Ecology
10-15%
Heaviest units. Where a fixed hour returns the most marks.
Published unit weight, as a share of the total exam score.
Syllabus order is not exam order, so Sia weights your study days by what each unit is worth rather than by when it is taught. College Board publishes unit weights as ranges, so they do not sum to 100%. Weights are taken from the published Course and Exam Description and can change between years. Last reviewed 27 August 2026.
How the AP Bio agent works
From unknown starting point to a plan you can follow.
Three steps turn your current standing, your target and one fixed exam date into a plan that changes as you improve. It takes about three minutes and it is free.
Step 2
Build backwards from 3 May 2027
Choose your target score. Sia assigns every study day between now and exam day, weighted by published unit exam weights rather than by syllabus order.
Step 3
Practise, get marked, and re-plan
Work exam-format multiple choice and free response. Every miss produces coaching on the specific trap or the specific rubric point, then tomorrow's plan changes around it.
The loop runs after every session
- Sia measures which skills and traps cost you points.
- Your live score forecast moves with the evidence.
- The next study block is rewritten around what changed.
Experimental design
The marks are for the design, not the science.
Every free-response set includes a task that hands you a scenario and asks you to design or critique an investigation. The rubric wants a control, an identified variable, a prediction and a reason. A beautifully accurate description of the underlying biology earns none of those points.
Design questions are drilled as a fixed template
Control, independent variable, dependent variable, prediction, justification. Sia checks each slot explicitly rather than marking the answer as a whole.
Data tasks are a separate skill
Reading a graph, calculating with units and stating a trend with a reason are marks that do not require knowing the topic. They are the cheapest points on the paper and they are drilled first.
Explanations have to reach the mechanism
The exam repeatedly asks why. Sia flags answers that stop at what happens without saying how, which is the most common way a correct answer scores partial marks.
A worked question
What a marked answer actually looks like.
One question in the AP Biology free-response format, worked through the way the rubric reads it, with the point that goes missing flagged at each step.
Free response, experimental design
A student hypothesises that light intensity affects the rate of photosynthesis in aquatic plants. Available: identical Elodea sprigs, a lamp on an adjustable track, beakers of pond water, a metre stick and a stopwatch.
Design a controlled experiment to test this hypothesis, and predict the result with a reason.
Unit 3: Cellular energetics. Written by AskSia in the published free-response format. This is not a College Board question, and AskSia does not reproduce official questions or past papers.
1Independent variable
Distance from the lamp to the beaker, set at several fixed distances, for example 10, 20, 30 and 40 cm.
Where the point goes. The variable must be operationally defined. “Change the light” is not a measurable manipulation.
2Dependent variable
Number of oxygen bubbles released by the sprig per minute, counted with the stopwatch.
Where the point goes. It has to be countable or measurable. “How much photosynthesis happens” cannot be recorded.
3Controls
Same sprig length and species, same volume and temperature of pond water, same lamp and bulb, same counting interval. Run several trials at each distance.
Where the point goes. Name the specific variables held constant. “Keep everything else the same” does not earn the control point.
4Prediction with reasoning
Bubble rate will fall as distance increases, because light intensity decreases with distance, and the light-dependent reactions have less energy available to split water and produce oxygen.
Where the point goes. The prediction alone is half the point. The mechanism is what completes it, and it is the half most often missing.
Built around your score goal
A tutor, planner and test centre in one agent.
AskSia handles the whole AP Bio prep loop instead of giving you another pile of questions.
Four weeks of planweighted
12345678910111213141516171819202122232425262728
heaviest units
mid weight
light
Unit-weighted daily plan
Every day has a job, and the plan changes with you.
Sia plans backwards from Monday 3 May 2027 and weights each unit by what it is worth on the paper. Finish early, fall behind, or fix a unit and the next session changes automatically.
- Days allocated by published exam weight, not syllabus order
- A realistic target and live score range, not false precision
- Automatic re-planning after every completed session
Design task, markedslot by slot
✓Control identified
✓Independent and dependent variables named
×Prediction stated, but with no reason attached
×Mechanism missing: says what happens, not how
Rubric-level free-response marking
It names the point you missed, not just the grade.
AP free responses are scored on discrete rubric points. Sia marks your response point by point and tells you which requirement was not met, then drills that requirement specifically.
- Point-by-point marking against the published rubric structure
- Identifies the requirement you missed, not a vague grade
- Follow-up practice on the same rubric point in new content
Exam day timing3 hr
50%50%
Section I 60 multiple-choice questions, 90 minutes, 50% of the score
Section II 6 free-response questions, 90 minutes, 50% of the score
Hybrid Digital in Bluebook
Exam-format fidelity
AP Bio practice built to the hybrid digital format.
Practise in a full-screen interface with real section timing, figures and tables. From 2027 every AP exam is digital, so paper-only practice no longer matches exam day.
- Section timing matched to the real 90 and 90 minute blocks
- Practice selected for the units where you are losing marks
- A live AP score estimate that updates after every session
AP Bio practice tests
Practice built around your mistakes.
AskSia writes questions to the published Course and Exam Description format, then selects the ones you personally need. Every result updates your forecast and the next block of days.
Personalised
The set is chosen for you
Your diagnostic maps every unit. Sia selects questions at your difficulty band in the units where you are losing marks.
Full-length
Full-length practice exams
Both sections at real pacing: 60 multiple-choice questions, 90 minutes, 50% of the score then 6 free-response questions, 90 minutes, 50% of the score.
By unit
Drill a single unit
Work one unit when that is the gap, or let Sia choose based on where marks are leaking against exam weight.
Free
Free AP Bio practice, no credit card
The free tier includes the diagnostic, your plan, exam-format questions and coaching on every mistake.
1Sit a practice exam→2Sia marks it to rubric→3Your forecast moves→4Tomorrow's plan changes
Every AskSia question is written by AskSia to the published Course and Exam Description format. We do not reproduce or resell official AP questions, past papers or retired content. AP® and Advanced Placement® are registered trademarks of the College Board, which is not affiliated with AskSia.
Why AskSia
Four things the big players do not do.
Web apps hand you a question dump. Human tutors cost thousands. Official prep has no coaching. AskSia is a different category.
An agent, not a chatbot
Sia diagnoses, sets a target, builds the plan to 3 May 2027, drills you and re-plans around your weakest units.
vs. type-a-question toolsWeighted by what units are worth
Study days are allocated by published exam weight, so a heavy unit gets the hours it deserves and a light one does not.
vs. syllabus-order revisionRubric-level FRQ marking
Sia names the specific rubric point you missed rather than handing back a number out of ten.
vs. “good answer, 6/10”Free to start · $79 to finish
Prep on the free tier, then open the full bank and all practice exams for a one-time price.
vs. $80 to $200/hour tutorsWhy it runs on your desktop
A browser tab cannot sit an exam with you.
AP exams are digital and timed from 2027. AskSia is built as a real app on your machine, with your class notes and study history available.
Real exam conditions
Full-screen mode with real section timing. Practise the way you will actually sit the exam.
It reads your material
Add your class notes, a past FRQ, a screenshot or a textbook PDF. Sia finds patterns in your errors and folds them into the plan.
Works offline after launch
Your plan and question bank stay on the machine so you can drill in a library, in class, or on a plane.
One click from your dock
Open today's session without deciding what to study. That is how students keep a streak through a nine-month course.
Loved by 2M+ students
The agent students already study with.
Sia has supported coursework, lectures and revision across more than 2,000 universities and high schools. AP Bio prep uses the same agent, pointed at one exam.
2M+
students worldwide
2,000+
universities & high schools
iOS & Android
on the App Store and Google Play
★★★★★
Best Study Tool
"Love AskSia! I use it on my laptop everyday. I really like the summary and practice quizzes it creates."
M
MiniCh33se
★★★★★
Best ai for college students
"This is hands down the best ai tool for college students!! I've been telling my friends all about it, and they're hesitant at first but they end up using it because of how useful it is."
H
Hammerboe
★★★★★
Like this app
"My final week savior. Can't live without this for my graduate."
O
Oyhhhhhhhhhh
★★★★★
Accurate Recording, Super Helpful for Classes
"The recording feature is really good and accurate. I use it every class, and it helps me a lot with reviewing and organizing my notes. Definitely a useful tool for students!"
B
BROLIN12138
★★★★★
Easy A+
"I love using this in class to transcribe my lectures. Never miss a word the professor says."
A
Amberrrrrrrrrrr2353
★★★★★
Hardworking team and best recording service for AI
"Recording features are the best on the market, I can even ask question during the recording."
N
Nolan970326
Reviews published verbatim from the Apple App Store. They describe AskSia as a study agent rather than AP Bio outcomes specifically. Results depend on your starting point, your test date and the hours you put in.
Compare AP Bio prep
A complete plan, not another content library.
Compare the parts that determine whether a year of coursework turns into a score.
| AskSia | Official practice | Human tutor | Review book | |
|---|---|---|---|---|
| Typical price | Free / $79 once | Free with class | $80 to $200/hr | $15 to $25 |
| Adaptive daily plan | ✓ | — | sometimes | — |
| Weighted by unit exam weight | ✓ | — | sometimes | — |
| Rubric-level FRQ marking | ✓ | — | ✓ | — |
| Questions selected for your gaps | ✓ | — | sometimes | — |
| Digital exam-format practice | ✓ | ✓ | varies | — |
| Live AP score forecast | ✓ | Limited | — | — |
| Plans backwards from exam day | ✓ | — | sometimes | — |
Competitor pricing and features are typical ranges as of August 2026 and vary by provider and plan.
Exam day
AP Biology exam date 2027, and how many days you have left.
AP exams run over two weeks in May and there is one date for this subject. That single fixed point is what makes an AP plan easy to build backwards from, and expensive to start late.
Section I60 multiple-choice questions, 90 minutes, 50% of the score
Section IIFree-Response Questions6 free-response questions, 90 minutes, 50% of the score
Section weighting for the AP Biology exam. Total testing time 3 hr.
3 May 2027
Exam date, Session 2
—
Days from today
Hybrid Digital
Sat in the College Board Bluebook app
1 to 5
Scores, usually early July
Session 1 exams start at 8am local time and Session 2 at 12pm local time for most schools, including all schools in the lower 48 states, Hawaii and Washington DC. Late testing runs 17 to 21 May 2027. Dates are published by the College Board and can change. Your AP coordinator tells you when and where you sit the exam.
Taking more than one
Most students sit three or four.
Sia plans all of them in one calendar, so a heavy week for one subject is a light week for another instead of two plans competing for the same evening.
Reach your goal
Every day is planned
backwards from 3 May 2027.
Sia starts from the score you need and the one date you have, then works backwards. If you fall behind, tomorrow changes. If a unit is fixed, it stops appearing.
- 1Set your target AP score and confirm your exam date.
- 2Sia forecasts what the gap realistically takes and tells you when it is a stretch.
- 3Every session moves the forecast, so you always know whether you are on pace.
On pace, or told why not
No false promises
Sia will not pretend a 2 to a 5 in three weeks is easy. It shows what is reachable and builds for that.
Set my goal free
or sign up free in your browser
Simple pricing
Start free. Finish for $79.
One flat price for the complete AP Bio plan. No subscription and no hourly meter.
Free
$0
Free forever · no credit card
- Diagnostic and score range
- Day-by-day adaptive plan
- Exam-format practice and mistake coaching
- Live score forecast
- Full question bank and every mock
- Unlimited retakes and replays
Most popular
$79one-time
Everything in Free, plus:
- Complete question bank
- All full-length practice exams and FRQ sets
- Goal-locked planning after every session
- Unlimited retake replays
- Priority coaching on every mistake
Less than one hour with a private tutor. One-time payment, no renewal.
Built responsibly
Who makes this, and how the numbers work.
Prep should improve learning without pretending to be official material or promising impossible gains.
Original AskSia questions
Questions follow the published Course and Exam Description format but do not reproduce official questions, past papers or retired content.
Your study history stays protected
Your plan, files and performance are handled under AskSia's privacy and security controls.
Forecasts show uncertainty
Sia uses score ranges and tells you when a target is a stretch instead of promising a guaranteed result.
No unsupported score claims
AskSia does not promise a specific score or publish invented gains. Forecasts update from your own work and remain projections, not guarantees. AskSia is not affiliated with, endorsed by or reviewed by the College Board.
Frequently asked questions
Questions, answered.
The AP Biology exam is on Monday 3 May 2027, in Session 2. Session 1 exams start at 8am local time and Session 2 at 12pm local time for most schools, including all schools in the lower 48 states, Hawaii and Washington DC. Late testing runs 17 to 21 May 2027. Your AP coordinator confirms where and when you sit it.
The exam is 3 hr long. Section I is 60 multiple-choice questions, 90 minutes, 50% of the score. Section II is 6 free-response questions, 90 minutes, 50% of the score. It is a hybrid digital exam. Four-function, scientific or graphing calculator permitted. A formula sheet is provided.
Unit 7 is the heaviest single unit and it sits at the end of the syllabus, which is exactly where classes run short of time. Units 3 and 6 are close behind.
AP exams are reported on a 1 to 5 scale. Your raw marks from both sections are combined using the published weightings, then converted to the final score. There is no penalty for a wrong or blank multiple-choice answer, so leaving one blank is never correct strategy. Scores are usually released in early July, and College Board publishes the exact 2027 score-access dates in spring 2027.
In practice, Experimental design questions. The marks are for naming the control, the variable and the predicted result with a reason, not for describing the biology. Sia identifies which of these patterns is costing you marks and drills that specific pattern rather than the topic in general.
No, and no legitimate tool has them. Official AP questions are the copyrighted property of College Board. Every AskSia question is written by AskSia to the published Course and Exam Description format, then selected for the individual student based on the skills they are losing marks on. What matches the real exam is the format: the same question types, section timing, weighting and rubric structure. AP is a registered trademark of the College Board, which does not endorse or review AskSia.
Yes. AskSia is free to download on Mac and Windows with no credit card. The free tier includes the diagnostic, the adaptive day-by-day plan and personalised practice with coaching. The optional $79 one-time upgrade adds the complete question bank and all full-length practice exams.
Yes. From 2027 every AP exam is digital. AP Biology is a hybrid digital exam sat in Bluebook. You answer multiple-choice questions and read the free-response prompts on screen, then handwrite your free-response answers in a paper booklet. Practising on paper alone no longer matches exam day, which is why AskSia runs its practice in a full-screen digital interface.
Yes. AskSia is a native desktop app for macOS 12 or later, on Apple silicon and Intel, and for Windows 10 and 11. Both builds are code signed. There are also iOS and Android apps, and AP prep is one of several study modes inside the same account.
Your target score is
a plan away.
Download free, take the diagnostic, and have a day-by-day AP Bio plan running to 3 May 2027 in about three minutes.
Free on Mac & Windows · $79 one-time for the complete bank and all practice exams
