I used to get 100% in tests in highschool. However towards the end it was very rare, and usually involved some crazy ridiculous but ultimately satisfying study. In the case of english you had to would literally be able to make the teacher cry with your work, no I’m not joking.

I strongly suggest though, that you also treat topping the grade/class as 100% because otherwise you’ll go insane. I know at university it is impossible to get 100, just due to scaling. Topping the grade is no walk in the path either, but at least its in the realm of possible