From Quora: "What should I do to improve my SAT Math and Reading score?"

Click here for the original Quora post. 

Look up the official SAT practice tests, available for free from the College Board. You can find them here:
SAT Practice and Preparation

https://satsuite.collegeboard.org/sat/practice-preparation

You can also find access to the Khan Academy website from on that website. Khan is the official SAT prep provider of the College Board, and its resources are both free and excellent. If you can get a practice SAT book such as Barron’s, Gruber’s, Princeton Review, Kaplan, etc., that would also work. You can often borrow these books for free at public libraries, or get them for free from people who took these tests in prior years (the SAT hasn’t changed since 2016, so any test book from 2016 or later should be fine).

For the reading, I suggest you just read many challenging essays - you can find tons of free articles on the Internet - from literally any newspaper or magazine. It’s a good idea to study how essay/editorial writers structure their arguments. Additionally, you should study the grammar and punctuation that is tested in the writing section, and also learn word roots so you can tackle unfamiliar words that use Greek, Latin, or Anglo-Saxon prefixes, roots, and suffixes (suffices? Hmm, I’ll have to look that up). All of these will be in any good review
book, such as the ones I’ve listed above.

Here’s a website where you can look up word parts to learn to decode vocabulary words:
The web’s largest word root and prefix directory

https://www.learnthat.org/pages/view/roots.htmlFinally, you can look at YouTube videos such as those on my channel.
SAT and ACT

https://www.youtube.com/playlist?list=PLF09TfOt7OnlxnTpeSHz7I0DlbXcrK7ifThose are also free and helpful. Good luck!