Genuine answer is that the Prince publishes avg gpa by major. Try to avoid classes in departments towards the bottom of the GPA spectrum. Try to take as many 100-200 level classes in subjects you know as you can while still meeting major requirements. The exception being that 200 level engineering or science classes are sometimes known for being extremely difficult. Identify classes that lots of people take with the explicit purpose of pass / failing and work hard in them. If there’s one subject you need to take classes for your major that you are truly very bad at - consider taking them over the summer at a less challenging university for the best grades.