What happens if you put wrong high school grades information of the ACT registration?

Does the college you go to even look at that? Can you edit the information online after taking the test? Does the college you're going to look at the high school transcript instead of the ACT grade information you give, or is it just for college recruiting purposes?What happens if you put wrong high school grades information of the ACT registration?you will have time to edit the paper work later and not all colleges are the same and just take the gamble.