The grammar questions on the Digital SAT live in the Reading & Writing section, under a domain called Standard English Conventions. They test sentence structure, verbs, punctuation, pronouns, modifiers, and how ideas connect — the mechanics of correct, clear writing.
Here's the good news: grammar is the most learnable part of the whole test. It's rules-based, the College Board reuses a small set of concepts, and once you know a rule you can apply it every time. That makes grammar the fastest place to pick up points.
This guide maps out everything the Digital SAT tests, then points you to a deep-dive guide for each topic so you can go as deep as you need. Start anywhere — or read straight through.