How long should i study each subject like for math, science, english, and history.

About an hour. :)

Brainliest answer, please? My friend and I are competing :P

I would say about half an hour per subject. It's hard to generalize this, though. You should study for as long as you feel appropriate (maybe quizzing yourself along the way with Quizlet or your own resources) or until you feel completely comfortable with the material. For math, I normally spend 1-2 hours studying, but for French, I spend maybe 20 minutes. It all depends. I wish you the best of luck!

Hope I helped! :) (would you mind giving Brainliest? I'm trying to increase my title. I'd really appreciate it!)