Resources & references

Stick close to official material. Most third-party SAT prep is mediocre, miscalibrated, or both. These are the few resources worth your time.

Official (College Board)

Bluebook app — Required test environment. Contains 6+ free full-length practice tests and a question bank.
SAT Suite home — Registration, score reports, test dates.
Practice & preparation — Official practice questions and study tips.
What's on the test — The canonical content breakdown by domain.

Official Digital SAT Prep on Khan Academy — Free, College-Board-partnered, adaptive. The best free third-party resource because it's actually first-party-blessed.
Khan also has full math review series for any topic where you're weak: algebra, geometry, statistics.

Most SAT books are outdated for the digital format. The ones worth using:

The Official SAT Study Guide (College Board) — practice tests + breakdown of question types. The first-party reference.
Erica Meltzer — The Critical Reader: Reading & Writing series. Best third-party verbal coverage; clear rules + drills.
Erica Meltzer — The Ultimate Guide to SAT Grammar. Companion volume for the Conventions domain.
College Panda — SAT Math (Nielson Phu). Topic-organized, clean explanations, harder than Bluebook for ceiling practice.

Buy at most two of these. More books ≠ higher score; review depth does.

Bluebook question bank (inside the app). Hundreds of standalone questions, sorted by domain and difficulty.
College Board QAS releases from past paper tests — most useful for Math; the old RW format is structurally different from digital.
UWorld SAT (paid) — Big problem bank with detailed explanations. Use only if your error log shows you need more volume on a specific domain.

Desmos calculator — Same one built into Bluebook. Practice with it now so it's instinct on test day.
On-screen reference sheet — Always visible in Math. Includes area / volume formulas, special right triangles, circle facts. Memorize anyway so you don't lose seconds looking.

Read widely. The SAT pulls passages from literature, history, social science, and natural science. Real cross-domain reading at home builds the comfort needed to parse unfamiliar topics quickly.
NYT Learning — Free educator-curated articles. Practice for reading complex prose at speed.
Grammar reference: Purdue OWL has good free pages on every grammar topic the SAT tests.

Skip generic "tips" videos. Most are clickbait and outdated for the digital format.
Use video only when stuck on a specific question. Search the exact question type ("digital SAT vertex of parabola") instead of generic tutorials.
The Bluebook explanation for each missed question is the first thing to read — it's the official rationale.