We would suggest the College Board book "the official SAT study guide" plus the StarCatcher SAT self training kit that help you to pinpoint your weaknesses and focus your effort on your weak-spots. Therefore it helps you to study smarter, not harder.
The above SAT self training kit acts like a private tutor but at a very low price ($399).
The following four items are included in the SAT Self Training Kit:
- Online word practice for over 5000 SAT words
- SAT I Video courses - 28 unit video courses that review all the subjects/concepts/skills on the SAT I
- Answer explanations for practices tests - Answer explanations for the practice tests in the book "Official SAT Study Guide"
- SAT I: Identify weakness
- Hundreds of SAT practice questions
- Essay grading by SAT essay experts
- Unlimited email assistance