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However, depending on your major, you need an overall grade that allows you to graduate. In my case, it was impossible to graduate unless the overall grade was C+ or higher.
Por ejemplo, en Mexico y parte de los paises latinos, usan un sistema decimal (Del 1 al 10); donde el 1 es basicamente "Reprobado" y 10 equivale a "Aprobado" o Exelente...
Anyway, in my case, I studied avg 3 hours a day and was able to graduate a university with a fine grade (based upon 3rd, 4th years which is the hardest). Everything else I just played video games only.
I think the secret of getting good grades is how well you can memorize lol. If it was understanding, then all schools and university will let you use textbook while testing, but they don't. So just first try to underastand, organize what you learned in a form that you think you can memorize easily, and memorize all.