Your child can use any of the strategies mentioned above, but the definitive first step is to organize materials. Class notes and any other significant papers should be organized according to topics. Textbook headings help by organizing topics using boldface type. If the amount of information is overwhelming, making a list of general topics, dividing them up over several days, and tackling them a little at a time is much more effective than looking at the whole piece over and over again. Odds are it's on the test.
Most teachers make time to meet with students after school.
It is very appropriate for your child to stop in before a test, especially if it is an area of difficulty, and ask a teacher to help her compile a list of key elements to focus on when studying.