One of the best SAT prep books is the Official SAT Study Guide, which is authorized by the makers of the SAT. Its main advantage is that it contains ten full-length practice tests that feature actual SAT questions. Additionally, it provides web-based score reports for free.
One of its strongest points is its math section, which contains sample problems and helpful descriptions. Its practice tests, alongside its reliability in predicting SAT scores, make it essential for students who plan to take the SAT. One flaw of the guide is its lack of explanatory notes and strategic advice, meaning that other SAT guides complement it well.