I have noticed GPA calculation "bug" in our University, what should I do?
What is the clever thing to do when one finds such regulations in own University which can be used on one's own good?!?


I'm so glad you asked.  The clever thing would be to realize that the best way to raise your GPA is to do excellent work in all your courses.  Aside from being the optimal strategy GPA-wise, this has the fringe benefit that it is the only strategy with inherent rewards beyond the GPA game.

Look, I don't know where you're enrolled, but your university has taken a step down a dark road by playing with weighting GPA's differently than the number of credits or course hours (which is the weighting which corresponds to the actual instructional time and, ideally, to the workload of the course).  You're contemplating a further step down this dark road by trying to play games with their game.  It is up to them how they compute the GPA.  I disapprove of their strange weighting system, but do you know what's even worse than a globally enforced strange weighting system?  A student who asks for "a specific GPA calculation for myself".

Just rise above.  See if you can recapture the quaint idea that your goal is to learn the course material rather than attain a certain number at the end.  Or, if you feel that the world has moved on and that number that you get at the end is too important to your future to so naively dismiss, then respond by GETTING BETTER GRADES.  Merciful Minerva, we live in strange days.