If you are looking for more time, explanation or examples for a particular class, consider Requesting a Peer Tutor.  A tutor gives you the chance to meet 1-on-1 with a peer who has taken the class and can talk through the material, provide additional insight or share a different perspective.  Peer Tutors are available for most 100 and 200 level courses, and can meet with you weekly at a time and location that is convenient for you.