The following resources may help you prepare for the tests.
Reading/Math/Writing
https://accuplacer.collegeboard.org/student/practice
https://www.mometrix.com/academy/accuplacer-study-guide/
https://www.mometrix.com/academy/accuplacer-practice-test/
Math
Quantitative Reasoning is the first math test. Study the following link thoroughly to prepare for the test.
If you score 263 or more on the above test, you will trigger a second test, Advanced Algebra and Functions. The better you do on this test, the higher the placement.
For additional math review: