Answer:
Its easy. Taking good notes is the key. You always want to do your homework and focus on what the Teacher is emphasizing. Listen to other peoples questions and ask your own questions. Find out exactly whats going to be on test and study for about 15 - 20 minutes a night, and you will only have to spend about a day or two in advance to study, depending on the severity to your grade. Also, try to get as much done as possible while you are at school and take the "gimme" grades and extra credit.
If you put in an honest effort it will be really easy! Just don't cheat yourself. And if your teacher knows your a hardworking student, they might give you some slack when you slip up.
Check out the related tips on how to study and take notes.