First off, Congrats Wensheng, great job!
Ok, the Math class... I guess technically you could say that the Math class might play a teenie, tiny role in the exam, but if you get a Math question it will be on a common sense level. Put it this way, if you budget 500 hours to study for the exam (which would be a BIG budget), and you allot 5 minutes of study for the Math class, I'd say you spent too much time on the Math class
This does lead to a good study tip though... if you see a class mentioned in a question, and that class isn't in the objectives, then the question isn't really about that class. In other words sometimes the exam writers will use such a class as a 'red herring', a distraction.
hth,
Bert