Utilize all the available resources:
Don't be afraid to ask questions. Even if your question isn't well phrased, the instructor will know you are confused about something. However, well phrased questions can help identify what you don't understand. For example, rather than saying "this section confuses me", try to be more specific and ask "why doesn't log(M + N) equal log(M) + log(N)." This type of question can help the instructor pinpoint areas of misunderstanding.
If you are stuck on a problem, show the instructor your method of doing the problem and the instructor can focus on your process and help you understand what steps were incorrect. If the instructor doesn't have any office hours, talk to the instructor before or after class and get help. If not possible, use email as a way of communicating with the instructor. Be sure to let the instructor know you are sending email, if you don't receive any replies.
Right after you get help with a problem, work similar examples to reinforce the concept.
Ask friends, members of your study group, or anyone else who can help. It will also help the classmate think clearly and carefully about how to explain the material.
There are several good tutors available to help you understand the material. It is helpful to have a specific list of questions prepared in advance. Try not to become dependent on the tutor. Help them help you better by formulating specific questions and do the work for yourself as much as possible.
Many textbooks come with ancillary materials that aid in learning. Ask your instructor to set up some of the resources if required.