To write down notes while you are in the class because I find it easier to explain it to yourself. You can use flashcards or study your textbook. I find the first suggestion best.
An easy way to study for midterm exams is to review ALL your notes. Review the concept. if you have a packet or a review packet go through that and study it care fully. The day before the exam sleep early, and in the morning eat a nice healthy breakfast which will make your stomach full. last but not least take your exam and try your hardest, DON'T CHEAT it will only effect you if you cheat.