Either read the cases or go for a secondary legal source. Don't bother with case summations. If you understand everything being discussed in class, read the cases and work on your skills at developing a legal rule based on the progression of the cases. Remember to compare the facts and analysis of the cases!
However, if you don't understand diddley squat about what people are talking about in class, and you are immediatley confused when you look at a sample essay question when getting ready to study for the exam, go to a secondary legal source and compare it to your notes. This will give you an idea about the format of the class and how the professor is developing a legal rule for you to learn. Remember, law school is based on the common law manner of developing law. It's good for your career as well as for the latter years of school to develop the skill at learning how the law progresses. God bless.