What are some of the best study methods when you have a day to study.

For me, it depends on the subject. Because I'm weird.
For social studies related classes, usually just reviewing facts is enough to let me get good test/quiz scores.
For science classes, I review the topics that I had the most trouble with, because science comes naturally to me, so the rest is easy.
For math, since I struggle with that the most, I put the most study time into it. I take whatever topics from the class that confused me most, and just do random problems related to that topic. This actually helps a great deal.

For English like vocab I write all the words on flashcard ( one time studying
then I go over them(second time)
I test myself ,what ever words i don't know,I'll put in a seperate pile.
then go through that pile and keep doing that process for history I make power points your reading and writing the information over again exposing yourself twice or you can YouTube videos on the subject

It was ernest rutherford