realistically, how many hours of studying do you need to guaranteed pass a STEM class

[MVP]

i went through entire law school without a single "hm, not sure i get it" moment.

ngl in my early twenties there have been a few moments where i read a law and had trouble immediately understanding what it all really means and implicates but ofc 99,9% of the time i get it. this never happened to you? well than maybe ur indeed the best lawyer out there.

but i do it this way: if i have trouble understanding sth, i just ask other people, internet or chatgpt