Studying

How do you guys study for science/math tests or exams? Best method? And how many days in advance do ya'll start to study?

Same as >>2 when I was still in high school.
Nowadays I check if there's anything complicated a couple days in advance, then try to fully understand those things. Once you understand how to derive things or use formulas, memorizing it isn't really necessary anymore.
And don't do your homework. Waste of time.