Here some tips that may come in handy to all students...
I'm lazy, but what's more i hate wasting my time. So as a lazy person who hates working like a creep for exams, there ya go:
Listen carefully in class, and when you feel like it, don't hesitate to ask teacher (or professor or wathever depending of your degree), they ain't bite, they can help you too! (Don't give a shit to all those kids who think that "oh boy, this guy sucks, he wants to befriend a teacher, such a wimp... blablabla" These are nonsense, don't bother with kiddos, useless, who won't help ya out anyway when you'll be in trouble in your everyday adult life)
Every day, read everything at the end when you're at home, read everything you did during lessons (takes at most 30 mins MAX! usually 15 mins.)
During weekends review all ya did the past week (should take at most 1 hour)
From time to time, i recommend ya to read everything ya did during the year (something like once per month?)
This should be fair enough
(exeptions to: medecine, biology, history, economics, where you got a shitload of stuff to remember by heart and understand)