AP Prep

Lessons & practice tests · 3 free lessons per section, 1 free practice test per exam

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AP Prep Lessons

Master every AP subject — Calculus AB, Biology, Chemistry, U.S. History, English Language, English Literature, Computer Science A & Psychology

275Lessons
📈

AP Calculus AB

49 Lessons

Analytical Applications of Differentiation

7 lessons
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The Mean Value Theorem and Rolle's Theorem

10 min

Apply the Mean Value Theorem to locate a point where a function’s instantaneous rate matches its average rate on an interval.

Medium
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The Extreme Value Theorem and the Candidates Test for Absolute Extrema

9 min

Identify all candidate points and determine which give the absolute maximum and minimum of a continuous function on a closed interval.

Medium
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Increasing/Decreasing Behavior and the First Derivative Test

11 min

Construct a sign chart for f′ to decide where the function increases, decreases, and classify each critical point as a peak or valley.

Medium
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Concavity, Inflection Points, and the Second Derivative Test

10 min

Use the second derivative sign to determine concavity, find inflection points, and apply the test to classify local extrema.

Medium
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Connecting f, f′, and f″

12 min

Interpret any graph of f′ (and optionally f″) to deduce increasing/decreasing behavior, extrema, and concavity of the original function f.

Medium
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Curve Sketching

11 min

Combine domain, intercepts, critical points, derivative signs, and end behavior to produce a complete, accurate sketch of a function’s curve.

Medium
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Optimization

15 min

Set up a real-world function, apply the derivative test, and justify the optimal value for area, cost, or profit problems.

Medium
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🧬

AP Biology

Preview7 Lessons
⚗️

AP Chemistry

55 Lessons

Properties of Substances and Mixtures

8 lessons
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Intermolecular Forces

25 min

Identify the dominant intermolecular forces in a substance and use them to explain large differences in boiling points.

Medium
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Solids, Liquids, Gases and the Four Kinds of Solid

22 min

Identify a solid’s classification by evaluating intermolecular forces and thermal energy, then predict its state at room temperature.

Medium
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The Ideal Gas Law and Partial Pressures

19 min

Apply PV=nRT to solve any gas problem, convert temperatures to kelvins, and correctly use partial pressures without separate laws.

Medium
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Kinetic Molecular Theory and Real Gases

21 min

Determine when the ideal gas law fails by applying kinetic molecular theory assumptions and adjust calculations for real-gas behavior.

Medium
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Solutions, Concentration and Particulate Diagrams

17 min

Calculate molarity instantly, then construct accurate particulate diagrams showing solute-solvent distribution in any solution.

Medium
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Solubility and How Mixtures Are Separated

24 min

Use solubility principles to choose and execute the proper separation technique for a given mixture based on intermolecular forces.

Medium
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Light, Photons and What Spectroscopy Measures

21 min

Interpret spectroscopy data by matching absorbed light energies to molecular transitions, identifying substances from their spectra.

Medium
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The Beer–Lambert Law

17 min

Calculate concentration from absorbance using A=εbc and determine how much solute is present in a sample.

Medium
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Acids and Bases

8 lessons
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Brønsted–Lowry Acids, Bases and Conjugate Pairs

21 min

Identify conjugate acid-base pairs in reactions, track proton transfer, and predict products using the Brønsted-Lowry definitions.

Hard
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pH, pOH and Strong Acid–Base Calculations

14 min

Calculate pH, pOH, and ion concentrations of strong acids and bases while correctly applying significant-figure rules.

Hard
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Weak Acid and Base Equilibria

21 min

Determine equilibrium concentrations for weak acids or bases using ICE tables, Ka/Kb values, and the small-x approximation with verification.

Hard
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Molecular Structure and Acid Strength

20 min

Predict acid strength by analyzing conjugate-base stability from molecular structure, including electronegativity and inductive effects.

Hard
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Acid–Base Reactions and Buffers

19 min

Explain how buffers resist pH changes, write net ionic equations for neutralization cases, and evaluate buffer capacity in biological systems.

Hard
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The Henderson–Hasselbalch Equation and Buffer Capacity

19 min

Apply the Henderson-Hasselbalch equation to calculate pH of buffer solutions and assess how concentration ratios influence buffer capacity.

Hard
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Acid–Base Titrations and Their Curves

19 min

Interpret titration curves to locate equivalence and half-equivalence points, relate pH to pKa, and describe the four characteristic regions of a weak-acid titration.

Hard
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pH and Solubility

21 min

Predict how pH shifts will dissolve or precipitate salts by comparing reaction quotient to Ksp.

Hard
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AP U.S. History

33 Lessons
✍️

AP English Language

36 Lessons
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AP English Literature

39 Lessons

Narrator, Speaker & Perspective

7 lessons
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Point of View: First, Second, Third-Limited, and Omniscient

13 min

Analyze how a chosen point of view controls information, trust, and character intimacy, then explain its purpose in the text.

Medium
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The Speaker in a Poem Is Never the Poet

12 min

Distinguish the poem’s speaker from the poet, assess the speaker’s attitude and context, and interpret their role in meaning.

Medium
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Narrative Distance: How Close the Narration Stands

13 min

Evaluate narrative distance to gauge how tightly the narration aligns with a character’s thoughts, influencing sympathy and irony.

Medium
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Tone: The Narrator’s Attitude Toward the Subject

13 min

Deconstruct tone by tracing diction, syntax, detail, and imagery, then argue how the narrator’s attitude shapes interpretation.

Medium
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Irony: Verbal, Situational, and Dramatic

14 min

Detect verbal, situational, and dramatic irony by pinpointing gaps between words, expectations, and knowledge, and explain their significance.

Medium
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The Unreliable Narrator

14 min

Identify cues that reveal a narrator’s bias, evaluate their reliability, and craft essays that explain how distrust shapes meaning.

Medium
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Free Indirect Discourse: When the Narration Borrows a Character’s Voice

14 min

Detect seamless shifts into a character’s thoughts, annotate free indirect discourse, and analyze its impact on tone and insight.

Medium
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AP Computer Science A

26 Lessons
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AP Psychology

30 Lessons