To be successful in math you will have to take your time and be calm. One of the best things I have ever been taught was to look over a question 3 times and eventually you will understand 1 big thing or one little thing in the problem and it could start a chain of reactions to the problem. This shows that if you find something small in a math problem and understand it. It could actually make the problem a lot easier for you to understand.
Work Step by Step
The other thing that I learned that can help me is to practice some problems. The best way to practice some problems is to have a teacher by you and he or she corrects you if you did something wrong. The other good thing about this is that when a quiz or a test comes around you will be prepared and ready to get a 100% on the questions.