High-school courses you learn by doing.

The bridge to algebra, worked with things you move: number lines, fraction bars, a balance scale, algebra tiles. Thirty-eight skills on an illuminated map — master one and the next opens.

Angles, triangles, trigonometry and proof — plus the Solids Lab: turn prisms, cones and spheres in 3D, work out volume and surface area, and slice each one to find every cross-section.

Watch the secant tip over into the tangent, build the integral from Riemann sums, and spin regions into 3D solids of revolution — disks, washers and shells.

Reduce a matrix by dragging one row onto another, and multiply matrices row by column. Exact fractions throughout, with generated practice and a move count to beat.

A beating 3D heart synced to a live ECG, every bone of the skeleton in 3D, and diagrams where you click the real structures of a cell mid-division.

All 118 elements as 3D atoms, the valence shell lit and the open slots showing what each atom needs to bond. 3D molecules are next.

Predict, then run: projectiles, ramps, springs and pendulums with live vectors, free-body diagrams and graphs.

Chapter lessons built from a teacher’s own lectures, with timelines, real maps and the full transcript; a key-term deck; and exam-style practice that spaces itself out.

All twelve units in the same five parts: summary and timeline, key terms, practice, essay prompts, and the lecture itself.

Click directly on a masterwork to find what matters — iconography, period markers, technique. Every clickable region was drawn and captioned by hand.

Shift supply and demand — and aggregate supply and demand — by toggling the forces behind each curve, then watch the new equilibrium settle.

Grammar you fix in place on freshly generated sentences — click the wrong word, type the correction — and a vocabulary trainer built on Latin and Greek roots.

Every declension and conjugation as a grid you fill in, first-year vocabulary on spaced flashcards, and a reader where you click any word for its parse and meaning.

A vocabulary game you walk through: Mamie's 80th birthday at a Provençal farmhouse, every family word acted out by the family.

¡Así se dice! 1 vocabulary, capítulo by capítulo: flashcards, Leitner boxes, multiple choice and typing, with accents forgiven and the article checked.

A teacher opens a room, the class joins with a code, and everyone races through AP CSA and CSP questions — with an explanation of why each wrong answer is wrong.