After you take the test, check it, and analyze your answers, you can decide if you want more practice or if you want to take a course.

Meanwhile, you should be striving constantly to improve your vocabulary. How well do you know Latin and Greek root words? Students who have studied Latin score higher on the SAT, according to collegeboard, the makers of the SAT.

How well do you understand basic arithmetic, algebra and geometry? You may need to review the basic principals of these areas of math.

I think that a book that explains the types of questions that are asked for math, reading, and English, and gives you plenty of vocabulary practice, is more useful than an online course, because the test is not a computer test, but a paper and pencil test. If you study for that test using a book, you are practicing in a similar format to the test.

Good luck!