There is nothing to report. It's good for you to report both.
I just can't report 10 for my sophomore year. 10 can only be attended by students of 10 and below.
Then it doesn't matter if you don't study in advance. No matter 10 or 12, only the calculus preparatory course is taken.
Another difference is that after you pass 10, you pass aime, and you have to take usajmo.
If you pass 12, and then pass aime, you can take the usamo exam, and you'd better apply to a university.
Don't ask questions