What is the Difference in the SAT & ACT?
Both the ACT and the SAT are nationally administered standardized tests that help colleges evaluate candidates. Most schools accept either test interchangably. So as you begin to think about college and creating the best application package possible, your admissions plan should begin with the question, "Which test should I take?"

Here is a helpful websites that explains the differences:

http://www.petersons.com/common/article.asp?id=493&sponsor=1&path=ug.pft.advice

Comparison of the Scores
Once you have taken both tests, here is a helpful chart to help you determine which or your scores is more favorable.

http://phs.prs.k12.nj.us/guidance/SAT_ACT_Comparison.pdf