This is the procedure to solve any engineering problem, not just those in fluid mechanics. Many students haven't properly learned or used this since it may not have been needed, however, but now it is essential for success. Also, if you are having particular trouble with a certain area, there is no rule that says you can't do more on your own. The text has solutions to all even numbered problems. Talk to the Prof.
Many students only think of the last point.
If you don't understand something five minutes before the exam, it's too late. As always, e-mail is a good way to contact me.