Do I have to report summer school grades to colleges?

I took pre-calculus over the summer (online) so I could get ahead and take AP Calculus the following school year. I ended up receiving a C. Do I have to report the pre-calc class to colleges? I don’t want to since the C will lower my GPA. I only took the class so that my high school would let me move to AP Calc.

Do I have to report it?
If I don’t report it; what will colleges think when they see that I skipped from Algebra 2 to AP Calc?

You have to report it if your high school gave you credit for it. Usually if you are taking an online course that you had to request permission to do at your high school you have to get some kind of verification from that online program that you successfully completed the course, and that is usually a grade report of some kind. If your high school doesn’t require anything like that, then it won’t appear on your transcript and no one will ever know. Except of course you, you will know.

I don’t think every student who takes calculus takes precalculus so going from algebra 2 to AP calc probably not that unusual.