Try to find out more about all sorts of Operating Systems from other reliable sources.
Learn how to GSGS and ATM effectively, since most of the time, it might solve the problems you’ll happen to find later.
Try the DEMOs and previous midterm problems for each weekly assignments, it will help for doing the quizzes.
When in a pinch, ask for help from others. This course is part of a learning process, after all.
Do your best, and God will do the rest :)