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5-worthy AP prep across 30+ subjects.
AP exams are two-part: multiple-choice + free-response. Most students focus on the multiple-choice half because it's what practice books drill. But the free-response section (FRQ, DBQ, SAQ depending on subject) is where the difference between a 3 and a 5 actually lives. It's also where AI shortcuts do the most damage — a student who ChatGPT'd every homework FRQ has never actually written one from scratch.
Brainback fixes this by treating every AP-course problem as attempt-first. The Learn mode tutor won't produce a completed FRQ response; it walks you through the argument structure, corrects a misinterpretation, and hands the response back to you. Over a semester, this means test day is your 30th or 50th real FRQ, not your first.
The College Board's rubrics are subject-specific and public. Brainback's tutor is trained on the current rubrics per subject — when you ask 'was this a 6-point response?', it grades against the actual rubric, not a made-up standard. This produces calibration between how you feel about your response and what an actual AP reader would say about it.
We publish no score-gain figure and have run no cohort. What we will claim is the source of the practice: attach your teacher's slides, the College Board CED for your subject, and your past FRQs, and every problem, hint and recall card is written from those pages and cites the one it came from.
Total: varies by subject (typically 3 hours). Below is every section, with its duration, question count, and scoring role.
| section | duration | questions | scoring |
|---|---|---|---|
| Multiple Choice | typically 45-90 min | 40-70 depending on subject | ~50% of score |
| Free Response (FRQ) | typically 60-100 min | 3-8 questions depending on subject | ~50% of score |
| DBQ / SAQ (History/SS) | included in FRQ time | 1 DBQ + 3-4 SAQ (varies) | counted in FRQ section |
Scored 1-5. 3+ often earns college credit; 4-5 more competitive. AP Scholar: 3+ on 3+ AP exams. AP Scholar with Distinction: avg 3.5+ on 5+ AP exams.
Rehearsable. Predictable. Adjustable for your calendar. Each week has one focus and one specific Brainback move.
| when | focus | brainback move |
|---|---|---|
| Weeks 1-4 | Course units 1-3 as they're taught | Every homework problem in Learn mode. Explain-back on the key concept per unit. |
| Weeks 5-8 | Course units 4-6 | Recall queue at 100+ cards. First mock FRQ under real conditions. |
| Weeks 9-12 | Course units 7-9 + cumulative review | One full past AP exam. Any concept < 4/5 explain-back gets a targeted week. |
| Weeks 13-16 | Full-length past exams + rubric practice | Full-length practice exam. FRQ rubric-graded. Every rubric miss becomes a card. |
| Final weeks | Rest + targeted weakness kill | Recall only in the final 5 days. Sleep. Trust the semester of compounding. |
Add each AP class as a Learn subject on the first day. That's the switch that makes Brainback treat them as academic.
A representative exchange: the problem, your attempt, the tutor’s response, your follow-up, the downstream card. Notice the tutor never solves.
AP Bio FRQ: 'Explain how natural selection can lead to reproductive isolation between two populations of the same species.' (4-point rubric)
Natural selection favors different traits in different environments. Over time, the two populations become different enough that they can't reproduce.
You've got the general shape — natural selection → divergent adaptation → reproductive barrier. That's worth 2 of 4 points on this rubric. To get to 4, you need to name the SPECIFIC mechanism of reproductive isolation (prezygotic vs. postzygotic) AND give a concrete example. Which barrier type would you argue for?
Prezygotic — like if the populations start breeding at different times of year, they can't interbreed even if they meet. Behavioral isolation basically.
All seven product surfaces are always on. For this exam specifically, these three carry the load. Each has its own dedicated page.
And the specific Brainback mechanism that catches each one. This isn’t a promise — it’s what the workflow is designed to do.
AI-drafting FRQs on homework, freezing on the real test
Every homework FRQ runs through Learn mode (which refuses to write it). By May, you've written 20+ FRQs from scratch.
Unit 1 content forgotten by the time you're studying unit 9
Recall queue keeps early-semester content warm through May. Cumulative retention is the whole point.
'I got a 5 on the practice exam but a 3 on the real one'
Practice exam calibration is closer to real when you use the actual College Board rubrics. Brainback grades to those rubrics — no more inflated self-scoring.
Common approaches that feel productive but produce nothing. Skipping these is worth as much as adding a technique.
because · You'll fatigue. 2 full past exams in the final month is the useful cap.
because · AP redesigns have changed multiple exams; verify current unit weights from the College Board CED (Course and Exam Description) for your subject.
because · The recall queue built from January to April is what carries you. If it wasn't built, cramming won't fix it — but Brainback keeps you from being in that position.
We do not publish an expected score movement; no study, no number. The structural point is where the tutor concentrates: the free-response half is roughly half the score and the half AI shortcuts hollow out fastest, because a student who had an assistant draft every homework FRQ has never written one. Learn mode refuses to write it, so by May you have written dozens.
Student ($9.99/mo) if taking 2+ APs. Free tier covers one AP class comfortably; two or more benefit from unlimited access. See all plans →
STEM APs (Bio, Chem, Physics, Calc AB/BC, CS, Stats) are the strongest fit — the attempt-first workflow is designed for reasoning. Humanities APs (History, English, Psych) also work well; the tutor handles FRQ prompts and DBQ outlining.
Yes — Learn mode coaches your thesis + outline without writing the essay body for you. Efficiency mode drafts non-AP writing.
The tutor is trained on the current College Board rubrics per subject. When you ask 'was this a 6-point response?' it grades against the rubric — not just gives you a number.
Yes for research design + methodology critique in Learn mode. The paper itself stays yours; Efficiency mode helps with formatting + citation questions.
Add it manually in Settings. You can attach the College Board CED PDF as a materials file so the tutor uses the current framework.
The years when learning habits either form or don't. Brainback makes the habit inevitable.
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Student ($9.99/mo) if taking 2+ APs · cancel anytime.