AP

AP stands for Advanced Placement, and indentifies college-level courses that can be taken in high school.

AP courses are offered by the College Board and is more common in the United States.

This Site's Recommendation:

This site recommends taking as much AP Courses as possible, for they show colleges that the student can handle courses with more rigor and is more prepared for college.

How do I join AP ?

You can take an AP Course at any time. Courses and there prerequisites can be found here.