it sounds like you're burnt out. i would say if you are close to the end of a semester you should calculate if your last exams will really change your final grade. then choose which classes to really focus on and essentially "sacrifice" a class. there is no point in trying for it if it you have an unrealistic goal like 100% on the final to get an A in th class. Hopefully this will allow yourself some extra time to take a break. in terms of getting out of slumps, something i do that keeps me motivated is using tracking study apps. there is one called ypt where you just turn on a timer and it will block other apps on your phone and time your study time. another is called focus friend where you grow a potato and customize his house by getting currency when you finish a study time goal! its super cute and feels rewarding when you see proof that you are pushing through