If you paid for the course, I would do ALL of the problems. You will learn something that you did not know before-- now is the time to study and study HARD--you only want to do this one time-- not 3 or 4 like many folks on this board. If the Professor said to do them, then buck up and get started. Remember, you only want to do this one time.
I am taking Goswami Course, but I am not going to spend time to study PM classes. I better work out few more transportation problems. However, I will take WW PM, or at least listen the most of it. And I am planning to work out all of the AM problems. Structural, however, is getting very hard for me, but the rest of the subjects, should be easier. This is not my first time and I thought that I was well prepared last time. One thing I learn, should be steady, constant study. No laziness and weaknesses. Its so hard to study in the evening, but this is the way to win this game.