If your learning style demands a study group, then form or join one. Meet your instructor after class for clarification or just get to know him or her. Ask the instructor if you can tape the class if that is your style. You may wish to get tutoring help from other students. It is also a good idea to develop some memory strategies such as review, rehearse, associate or organize.
Time management is always a key.
If you are a working adult or have family obligations, it becomes crucial to manage your time carefully. Some students treat school like a job and spend the appropriate amount of time. Others like to be active in many different parts of life and can concentrate better that way.