Summer programs and Common App

Where do I list summer college classes on Common App as a high school student? Do I list my GPA at the institution as well?

If you got college credit, they go in the college section. If you feel it is unclear, you can also put a couple sentences of explanation in additional information.

Yes, I got 3 college credits for it and a GPA for the course that would show up on that university’s transcript. Should I list the GPA in the additional info section as well, or would that come off as pretentious? (4.0 for accelerated pre-calc)

You can. You know you need to get an official transcript for the class from the university and send it, right? My kid did a summer program that gave college credit for two summers, and they provided the transcripts.

My DD was told not to send cc transcript since that information was on her HS transcript already.

Yes, if the HS incorporates it into their regular transcript that is fine. But some students take classes that are not accepted by their high schools. Those students need to make sure an official transcript gets to the colleges they are applying to.