RESOURCE GUIDE · WHAT TO USE, AND WHEN
The whole toolkit.
Know what each one is for.
Six great AP Calculus AB resources, each with a different job. Two are full courses with practice — Khan Academy and Calc Medic. Four are video channels — 3Blue1Brown for intuition, Professor Leonard for the full lesson, The Organic Chemistry Tutor for worked examples, TI in Focus for the exam. Here's what each is good and bad at, and exactly where to use it.
§ 01
Courses & practice
Start here for structure. Both are organized by the same College Board units as this site, and both give you something the video channels can't: practice you can check. Both are free to use.
◆ Full course · free practice
Khan Academy
The complete AB course — video, then exercises, quizzes, and a unit test for every unit.
Best for — Structured self-study and practice that grades itself, unit by unit.
- The only resource here with auto-graded practice + progress tracking — you find out instantly what you got wrong.
- Organized to the College Board units — its Unit N lines up with this site's Unit N.
- Bonus: Sal's "solved AP exams" videos walk through real past FRQs step by step.
- Videos are practical, not cinematic — 3Blue1Brown and Leonard go deeper on the "why."
- No full official practice exams — pair it with College Board's released exams.
◆ Practice bank · exam review
Calc Medic
Built by two AP teachers — a free, searchable database of every released FRQ, plus a CED-aligned review course.
Best for — Drilling FRQs by unit/topic, and a focused spring review.
- Free FRQ search tool: every released AP Calc free-response question since 1998, filterable by unit, topic, and question type — the fastest way to drill one skill.
- "Experience First, Formalize Later" — concept-first lessons that build real understanding.
- Review course: 25+ videos following the CED, phone-friendly.
- The site is built for teachers (lesson plans, free sign-up) — student self-study takes a little navigating.
- The polished Review Course is paid per student (the FRQ database and curriculum are free).
§ 02
The four video channels
Each plays a different role in the learning cycle — preview, learn, review, or exam. Match the channel to what you're actually trying to do.
◆ Intuition · the "why"
3Blue1Brown
Essence of Calculus — beautiful animations that make the ideas click.
Best for — Summer preview & building mental models before the details.
- Unmatched visual intuition: derivatives, integrals, and the FTC finally make sense.
- Short (~15 min) and genuinely enjoyable to watch.
- Only ~11 videos — does not cover every AB topic.
- No practice problems and won't teach you to compute — pair it with the others.
◆ Full lecture · learn from zero
Professor Leonard
Complete, patient university lectures — the way to learn a topic properly.
Best for — First real learning of a unit, or when a topic didn't land in class.
- Thorough and clear; works many examples, so you truly understand.
- Covers all of Calculus 1 (and Calculus 2 for differential equations).
- Very long — 1.5 to 2.5 hours per lecture.
- His lecture numbering isn't the AP unit numbering (this site maps it for you).
◆ Worked examples · the workhorse
The Organic Chemistry Tutor
Fast, crystal-clear worked examples for essentially every topic (don't let the name fool you).
Best for — Review, homework help, and "how do I solve this kind of problem?"
- Covers every AB topic; superb for procedures — related rates, optimization, u-sub, area/volume.
- Concise and to-the-point; great final-exam-review compilation videos.
- Procedural, light on the deep "why" (the opposite of 3Blue1Brown).
- Not AP-format; so many videos you need a map — use the table below.
◆ Exam & calculator · test day
TI in Focus: AP Calculus
Real AP free-response questions solved with graphing-calculator strategy, by AP exam insiders.
Best for — Spring exam prep: calculator skills and FRQ practice.
- 100% AP-aligned; made by a former AP Chief Reader and a development-committee member.
- Teaches the exact TI-84 / TI-Nspire techniques you need for the calculator sections.
- Not for learning concepts from scratch — it assumes you know the calculus.
- Narrow (FRQ + calculator), organized by question/year, and some content is BC.
§ 03
Which channel for which unit
The channels overlap on the core theory units and diverge on the application units — where 3Blue1Brown goes quiet, The Organic Chemistry Tutor and TI in Focus take over. Read across each row to pick.
| Unit |
3Blue1Brown |
Prof. Leonard |
Organic Chem Tutor |
TI in Focus |
| 1Limits & Continuity |
◎Ch 7 — limits & ε-δ |
◎Lec 1.1–1.4, 3.5 |
◎Limits & continuity set |
·rarely a full FRQ |
| 2Definition & Basic Rules |
◎Ch 2, 3, 5 |
◎Lec 2.1–2.5 |
◎Derivatives set |
·— |
| 3Composite/Implicit/Inverse |
○Ch 4, 6 |
◎Lec 2.6–2.7 |
◎Chain & implicit |
·— |
| 4Contextual Applications |
·not covered |
○Lec 2.8 related rates |
◎Related rates, motion, L'Hôpital |
◎motion/rate FRQs (calc) |
| 5Analytical Applications |
○Ch 10 (concavity) |
◎Lec 3.1–3.7 |
◎Curve sketching, optimization |
◎graph-of-f′ FRQs |
| 6Integration & Accumulation ★ |
◎Ch 8, 9 |
◎Lec 4.1–4.5 |
◎Integration, u-sub |
◎accumulation FRQs (calc) |
| 7Differential Equations |
·not covered |
○Calc 2 · sep. of variables |
◎Slope fields, sep. of variables |
○appears in some FRQs |
| 8Applications of Integration |
·not covered |
○Calc 1 · Lec 5.1–5.2 |
◎Area, volume, cross-sections |
◎area/volume FRQs (calc) |
◎ go-to for this unit · ○ useful/partial · · thin — look elsewhere.
Khan Academy and Calc Medic follow the same CED units directly — no map needed: open their Unit N when you're on this site's Unit N.
§ 04
A study rhythm that uses them all
Each resource belongs to a different phase of the year. This is the loop we suggest for every unit.
1
Preview · summer
Get the big picture first so the details have somewhere to land.
3Blue1Brown
2
Learn · in class
Learn the unit properly, then fill gaps with faster examples or a structured course.
Prof. Leonard
Organic Chem Tutor
Khan Academy
3
Practice · ongoing
Drill with auto-graded exercises, then redo the MCQs on the unit map.
Khan Academy
Organic Chem Tutor
4
Exam prep · spring
Master the calculator and drill real FRQs by topic, then work the Practice page.
TI in Focus
Calc Medic FRQs