AP, IB, Dual Enrollment, and Early College are options to earn college credits while still in high school. These courses can save you time and money! John explains the benefits and the caveats, and how to consider which might be the right option/s for you.
Please verify current AP exam fees, IB program fees, and dual enrollment/early college costs with specific colleges.
You may also find these topics of interest:
The Latest on AP Test Scores
Reduce (Or Raise) Your Cost of College
College Credit by Examination (CLEP)