How to Pass a Course/Practice
The old adage says practice makes perfect. That´s true of everything in life, so too for a student. Too often it happens that we study hard for some time, attain a peak level of mastery and feel we have attained it once and for all. Then we stop practicing confident that we have it. Sadly that´s not true for anything. Things have a tendency of slipping away if you don't practice. So practice, revise in case of changes in theory. Keep solving repeatedly in case of problems.
Once we have practiced something a sufficient number of times, it seems that our bodies remember the correct responses much better than our minds do. This is what makes us able to, for example, drive a car and carry on a conversation at the same time.