From site:  Majortests helps you prepare for the SAT by giving you free practice tests. You don’t need to register or create usernames and passwords. Our questions are developed by test prep professionals.

We have hundreds of SAT practice questions arranged into mini practice tests, each practice test has a score card at the end. We also give you explanations to the questions you get wrong so that you can learn from your mistakes. Use the menu on the left to get more information about the test sections, or choose a question type and do a test now.

Quizlet SAT

Quizlet has thousands of sets of flashcard games you can use to study SAT vocabulary and math skills.

Khan Academy SAT Preparation app

Khan Academy provides comprehensive reviews and practice tests for the full SAT. It has tons of practice problems in math, reading and writing. Once section is devoted to tips and test-taking strategies for each section of the test.

Khan Academy lessons are now available as an app for iPad/iPhone and Android devices.

SAT Vocabulary Lists

This site provides vocabulary lists for SAT practice. There are dozens of lists categorized by beginning letter. Free registration is required. You select the lists you want to practice. Then you review and practice each word. Those that you have trouble answering correctly come up for review again until you’ve mastered them. The site is responsive, so that it works on screen sizes from desktop down to smartphones.

The CollegeBoard: SAT, PSAT and AP Prep

From site:  The College Board is a not-for-profit membership association whose mission is to connect students to college success and opportunity. Founded in 1900, the association is composed of more than 5,200 schools, colleges, universities, and other educational organizations. Each year, the College Board serves seven million students and their parents, 23,000 high schools, and 3,500 colleges through major programs and services in college admissions, guidance, assessment, financial aid, enrollment, and teaching and learning. Among its best-known programs are the SAT®, the PSAT/NMSQT®, and the Advanced Placement Program® (AP®). The College Board is committed to the principles of excellence and equity, and that commitment is embodied in all of its programs, services, activities, and concerns.