Master the Concepts

Visual lessons that build understanding from first principles — TEKS-aligned for CBE, AP-aligned for AP courses. Practice questions follow where available.

Texas CBE Subjects (8) AP® Background Reading (2)

Texas CBE Subjects

Algebra 1

Linear equations, inequalities, functions, quadratics, and polynomials. Covers TEKS §111.39.

11 lessons available

Geometry

Lines, angles, triangles, circles, proofs, and trigonometry. Covers TEKS §111.41.

11 lessons available

Algebra 2

Functions, polynomials, exponentials, logarithms, and conic sections. Covers TEKS §111.40.

11 lessons available

Pre-Calculus

Functions, trigonometry, sequences, conic sections, and analytic geometry — the bridge between Algebra 2 and Calculus.

11 lessons available

Biology

Cells, genetics, ecology, evolution, and body systems.

11 lessons available

Chemistry

Atomic structure, bonding, reactions, stoichiometry, gas laws, solutions, thermochemistry, and nuclear chemistry.

11 lessons available

Physics

Motion, forces, energy, momentum, waves, electricity, and modern physics.

11 lessons available

U.S. History

Colonial era through modern America — government, economics, geography, culture.

11 lessons available

AP® Background Reading

AP® Human Geography

AP Human Geography exam preparation — 7 CED units, MCQ + FRQ practice modeled after the official exam format.

42 lessons available

AP® World History: Modern

Free background-reading lessons for world history — concept and vocabulary support, not a graded question bank.

71 lessons available