Get to know your instructors, and be sure they know who you are. Good rapport goes a long way, and you'll have a better idea about what they personally respond well to. Some might be flexible with deadlines or offer input on unfinished assignments if they like you enough.
Sit at the front, attend every class, never drink to excess (or at all, if you can manage).
See if you can form/join a study group so you can quiz each other and help each other with areas of weakness. Whenever you explain something, you reinforce that knowledge. And sometimes it's faster to learn from someone who knows than to look it up yourself.