The Keystone School

Ratios, negative numbers, and the first equations — the arithmetic of childhood widening into the algebra of adolescence.

From the first unknown to the fundamental theorem — the long staircase, one honest step at a time.

From the crowded interior of a single cell to the tangled economy of a rainforest — the study of what is alive and why.

The physical sciences for the high-school years — what the world is made of, and the rules its parts obey.

The planet as a set of connected systems — rock, air, water, and life — and the pressures a growing species puts on them.

Two skills that never stop paying: reading closely enough to understand, and writing clearly enough to be understood.

How we got here, and how we govern ourselves now — the long record of human decisions and the systems those decisions built.

Where things are and why it matters — the land beneath human life, and the exchanges that organize it.

The body you will live in for the rest of your life — how it works, how to keep it well, and what to do when it isn't.

The practical scaffolding around the tests that gatekeep the next step — strategy, timing, and steady nerves.