Do colleges see high school GPA for transfer admission?

How do high school grades weigh for transfer admission? Would getting bad grades during second semester of a senior year hurt a lot? If I dropped an AP class during second semester of senior, what would be the impact of it?

which school you are transferring to?

Each place sets its own policy about HS records. So if you do end up transferring a year or two from now, check the websites of the places on your list, and see whether HS records matter or not.