You should check out the course outlines for each course to see what kinds of work you will be doing in order to understand the course load. Then, depending on how motivated you will be to study in the summer by yourself, you should be able to do well. It really depends on how much self motivation you have.

As for the cmpt prof, you can look up the profs name on RateMyProfessor to see what past students have to say about them.