4 AP courses · May 2027 exams

Learn each AP topic step by step, then practice it

163 interactive lessons for Calc BC, Micro, Macro, and Stats, 11 to 14 minutes each. A lesson explains one idea at a time with graphs you move through, then gives you at least 10 questions that build to exam level. Start from Unit 1 and go at your own pace.

Start freeWhat's in a lesson

The starting check is 4 questions per course. Free, no card.

AP Microeconomics · 2.7Predicting New Market EquilibriaScreen 2 of 5

Move demand, then follow supply

A product initially sells for $4, with 4 units traded per day. A favorable review increases demand. At the old price, buyers now want 6 units while sellers still offer 4. How does the market reach a new equilibrium?

Price ($ per unit)

D₀S₀D₁D₂E₀44

Quantity (units per day)

  1. 1

    Initially, D₀ and S₀ meet at $4 and 4 units per day, so neither side wants to trade a different quantity.

Step 1 of 4
One lesson

14 minutes, from explanation to exam questions

One Calc BC lesson on the chain rule, in the order you'd go through it.

AP Calculus BC · 3.1Differentiate Through Every Layer

  1. Explanation

    4 screens, no questions yet

  2. Key card

    The rule and 4 flashcards

  3. Worked example

    Every step says why

  4. Fill in one step

    A similar problem, your turn

  5. 10 practice questions

    From basic to exam level

All of this is from the lesson Differentiate Through Every Layer.

Courses

Four courses, from Unit 1 to the May exam

Each course follows the official units, with a lesson for every topic. Your plan starts at Unit 1 and spaces the units out over the weeks before the exam, keeping the last few weeks for review.

Example, starting today. You can open later units anytime.

  1. AP Calculus BC

    10 units · 54 lessons · 658 questions
    1. Start here1
    2. 2
    3. 3
    4. 4
    5. 5
    6. 6
    7. 7
    8. 8
    9. 9
    10. 10
    11. Review4 weeks
    12. Exam May 10

    Exam: 42 multiple choice in 100 min, 6 free response in 90 min, scored 1 to 5

    About 2 weeks per unit, 29 weeks until the exam.

  2. AP Microeconomics

    6 units · 26 lessons · 317 questions
    1. Start here1
    2. 2
    3. 3
    4. 4
    5. 5
    6. 6
    7. Review4 weeks
    8. Exam May 4

    Exam: 60 multiple choice in 70 min, 3 free response in 60 min, scored 1 to 5

    About 4 weeks per unit, 29 weeks until the exam.

  3. AP Macroeconomics

    6 units · 28 lessons · 345 questions
    1. Start here1
    2. 2
    3. 3
    4. 4
    5. 5
    6. 6
    7. Review4 weeks
    8. Exam May 7

    Exam: 60 multiple choice in 70 min, 3 free response in 60 min, scored 1 to 5

    About 4 weeks per unit, 29 weeks until the exam.

  4. AP Statistics

    5 units · 55 lessons · 670 questions
    1. Start here1
    2. 2
    3. 3
    4. 4
    5. 5
    6. Review4 weeks
    7. Exam May 11

    Exam: 42 multiple choice in 90 min, 4 free response in 90 min, scored 1 to 5

    About 5 weeks per unit, 30 weeks until the exam.

Coming later: AP Calculus AB, AP Physics 1, AP Chemistry, AP Biology, AP Psychology, AP US History, AP Computer Science A, and AP English Language.

Remember

What you learned comes back right before you forget it

A few weeks after a unit, a lot of it is gone, and before the exam it's hard to know what to review. After every lesson, its key points become 3 to 4 flashcards: 649 across the 4 courses. When you flip a card, you say how well you knew it. The better you knew it, the longer it waits before coming back.

  • Key points from every lessonRules, formulas, graphs and the most common mistakes are added when you finish the lesson. You don't make cards yourself.
  • Questions you got wrongThe step you got wrong becomes a card. The question comes back as a similar one after 1, 3 and 7 days. Get two right in a row and it's cleared.
  • No guessing what to reviewEach day's set holds only the cards and mistakes due that day, mixed across 4 courses and their units, the way the exam mixes them.
Card 1 of 3Sample
RuleCalc BCFrom a lesson

ddxf(g(x))\displaystyle \frac{\mathrm{d}}{\mathrm{d}x} f(g(x))

Say the answer in your head, then flip.

649 flashcards from 163 lessons

  • Calc BC216 cards
  • Micro104 cards
  • Macro112 cards
  • Stats217 cards
Every day

About 15 minutes a day, already planned

Open it and today's set is ready: your next new lesson, flashcards and the questions you missed, in order. Miss a question and a similar one comes back a few days later.

Today · about 25 minSample

200 days until the exam on May 7

Work down the list and you're done for the day.

  1. 9 flashcards dueCalc BCMacroStatsFlashcards5 min
  2. 3 mistakes to retryCalc BCMacroStatsA similar question for each one5 min
  3. Shifts in Aggregate DemandMacroNew lesson6 min
  4. Implicit DifferentiationCalc BCPractice · 8 questions9 min

On days you haven't practiced, one reminder by email, browser notification or Google Calendar. Never more than one a day.

Start today's set

After a wrong answer

Micro2.7 Changes in Equilibrium

Sample
The equilibrium price and quantity of insulated lunch bags both increase. Only one determinant of demand or supply has changed. Which event could explain these changes?
  • AShipping costs for lunch-bag producers increase.
  • BA new process reduces lunch-bag production costs.
  • CSeveral lunch-bag manufacturers leave the market.
  • DAn unfavorable review makes lunch bags less popular.
  • EConsumers develop a stronger preference for lunch bags.

Why people pick A

“Price-only check: I chose a supply decrease because it raises price, overlooking the resulting fall in quantity.”

Explanation:In the lunch-bag market, a single demand increase raises both equilibrium price and quantity. Stronger consumer preferences shift demand right and fit both observations. A supply decrease raises price but reduces quantity, so higher shipping costs do not fit.

Missed questions come back like this

  1. Today
  2. 1 days later
  3. 3 days later
  4. 7 days later

Each time it's a new question of the same kind. Get two right in a row and it's done.

Why wait a few days? Psychologists compared ten common study techniques. Only two, testing yourself and spreading practice over time, were rated most effective.Dunlosky et al., 2013, Psychological Science in the Public Interest

Free response

Write FRQs on paper and get graded point by point

Each rubric point shows whether you earned it, the words on your page it's based on, and how sure the grader is. Anything under 70% sure is flagged: your teacher confirms it if you joined a class, or you check it against the rubric.

From the prompt

Assume the economy of Country X is currently in a short-run equilibrium with real output below full employment.

PLReal GDPLRASSRASAD₁AD₂
  1. (a)Draw a correctly labeled graph of aggregate demand, short-run aggregate supply, and long-run aggregate supply. Show the current price level PL1 and real output Y1.3 points
  2. (b)Identify one fiscal policy action the government could take to restore full employment.1 point
  3. (c)On your graph in (a), show the effect of the policy in (b) on the price level and real output.2 points
  4. (d)If the government finances the policy by borrowing, what happens to the real interest rate in the loanable funds market? Explain.2 points

Ashore original · Long question · 25 min

Example grading

Recession and fiscal policy

6/8

(a)3 points

  • Correctly labeled AD, SRAS, and vertical LRAS“AD, SRAS, LRAS labeled”96% sure
  • Equilibrium Y1 to the left of full employment Yf“Y1 left of Yf”91% sure
  • PL1 and Y1 marked on the axes at the AD–SRAS intersection“PL1 written near the curve”Teacher check

(b)1 point

  • Increase government spending or decrease taxes“increase government spending”98% sure

(c)2 points

  • AD shifts to the right“AD1 → AD2 to the right”93% sure
  • Price level and real output both increase“PL ↑, Y ↑”88% sure

(d)2 points

  • The real interest rate increases“interest rate rises”95% sure
  • Explains that government borrowing increases demand for loanable funds“because the government spends more money”Teacher check

2 points under 70% sure went to the teacher.

Predicted score

A predicted score for each course, and where the points go

It only counts the questions and mock exams you have done, so the range gets narrower as you practice. Next to it are the three topics costing you the most points, ranked by exam weight times the gap.

Sample student

Score forecast

From 826 questions · last mock Oct 14

  • AP Calculus BC

    Range 3.1–4.2 · Target 5

    4of 5

  • AP Macroeconomics

    Range 2.6–3.8 · Target 4

    3of 5

  • AP Statistics

    Range 2.8–4.0 · Target 4

    3of 5

Recent mocks

  • Stats Units 1–2 checkpointOct 14 · 3
  • Macro Units 1–3 checkpointOct 10 · 3
  • Calc BC full mock #1Oct 4 · 3
Take a full mock

Where you're losing points

  1. Calc BC3.1

    The Chain Rule

    Forgets to multiply by the inside derivative

    −0.3on your AP score52% right

    Fix

  2. Macro3.6

    Short-Run Changes in the AD–AS Model

    Moves SRAS when AD should move

    −0.3on your AP score48% right

    Fix

  3. Stats3.6

    p-Values

    Reads the p-value as the chance the null is true

    −0.2on your AP score50% right

    Fix

Forecast to exam day

The band is how sure the forecast is. It narrows as you answer more.

Pricing

Start free, pay once for everything

No card to start. A season pass is one payment and doesn't renew.

  • Free

    Find where you are and build the habit

    $0

    No card needed

    • The starting check and your full result
    • 1 FRQ graded
    • Every day: 1 lesson and a review set of about 10 questions
    Start free

  • AP season pass

    Everything for AP this season

    $69

    About $10 a month until May 11

    • Every lesson, question set and unit check
    • All your mistakes and flashcards, every day
    • FRQ grading beyond the free one

  • AP and SAT

    Every AP course and both SAT sections

    $149

    About $19 a month until Jun 5

    • Everything in both season passes

Prices in US dollars. Paid once, no renewal.

Questions

See where to start

Answer a few questions: your target score and how long you study each day. After 4 questions per course, your plan is ready.

Start free