Do ask your instructor questions if you don't understand something. Ask during class, after class, or during office hours. Some people learn better in groups. Use the telephone if you are unable to meet in person. Additional resources Don't overlook the value of library books or textbooks other than the one recommended for the class.
Different authors approach topics in different ways and include different illustrations.
Some students like to have coloring books on the topic of the class. These are grown-up coloring books and they have text you read as you color. These books are one more way to encourage yourself to spend more time reviewing the class material. Several publishers market books like these. Look for these books at local bookstores or at booksellers' web sites.