To get into Calculus, I had to study for the College Level Math Accuplacer. The test has to be taken on a computer on campus. The Accuplacer allows you to skip your online or on campus college’s Algebra, PreCalculus, whatever – according to how well you do on the test. One thing I learned from taking this test was that taking a test like this twice can yield a significant improvement from the first time. The first time I scored a 65. Then, with only around 8 days to study, I brought the score up to 98. So, do not be discouraged if you do not do well the first time. Here are some of the resources that I used to pass the test with a 98:
This is the best source:
Houghton Mifflin PreCalculus Quizzes
These PreCalculus quizzes and answers will help you to score higher, especially on the Trigonometry portion.
Here is another one that I found very useful:
This is an actual practice quiz that very closely simulates the Accuplacer. It does not explain the answers, but it will give you a really good idea of what the test is like:
http://academics.utep.edu/Default.aspx?tabid=25202
Some others:
http://professionals.collegeboard.com/profdownload/accuplacer-sample-questions-for-students.pdf
http://webs.anokaramsey.edu/schewe/math/math_practice_tests.pdf
Keep in mind that there are also a lot of useful videos on YouTube. Just query whatever you are confused about, and loads of videos should appear.