Much of the material here comes directly from Silverturtle’s SAT guide. Below is a link to the original thread, including links to some other websites and PDFs with useful prep material.
The Official SAT Study Guide Second Edition is a must buy for the real exams.
The Ultimate Guide to SAT Grammar, 2nd Ed by Erica Meltzer is very popular because she covers all the things you need to know for SAT grammar. Many students just don’t know what specific things to study since grammar is so broad, so her guide is a good resource.
There are a lot of other resources like Mike Barrett’s SAT Prep Black Book which largely has the same advice as what’s written on this website. No need to buy it unless you want some hard cover thing.
We’ll be publishing some ebooks that you can get later. Email firstname.lastname@example.org for more info.