In cloud computing, our exams try to stay closely aligned with material actually covered in lectures. As such, the best way to prepare is to review the lectures. We posted videos for every lecture online to help if you missed one or need to revisit some topic and listen to that part of the lecture again. Look for the "video" links on the syllabus.
We also posted a sample prelim here. A solution set will be available starting on Sunday February 27.