College Board has releasd these eight free official full-length SAT practice tests that are currently available online. Each test comes with an answer key and in-depth answer explanations to help you understand why you got questions wrong!
- Practice Test 1: Questions | Answers | Answer Explanations
- Practice Test 2: Questions | Answers | Answer Explanations
Khan Academy also has great SAT resources on their website. This 3 minute video shows how to utilize them!