Real course notes, worked examples, and problem sets in math, physics, engineering, and CS — written for motivated middle and high school students who want to go further.
The same notes, notation, and pacing used in college courses — no dumbed-down version, just a clear path in.
Play with functions, vector fields, and 3D surfaces right inside the notes. Seeing it move helps it click.
Homework draws directly from the notes you just read, so you always know why a problem is asking what it's asking.
Browse the catalog and start anywhere — no placement test, no account required to read.
Sessions are ordered and build on each other, the way a real semester does.
Each homework set uses the exact notation and examples from the notes you just read.
This site is built for students who've outgrown their current coursework — the ones asking "what comes after this?" We keep the material honest and college-level, but the on-ramp is designed for someone seeing the subject for the first time.
No account needed. Just open a course and start reading.