How to get and maintain high cgpa?

In first year now and ,so how to study for mids and all, I want to study like atleast 1 hour or even half an hour everyday instead of cramming everything in one day.

I will pakka procrastinate till last day if I don't start studying atleast 15-30 mins from now only.

How do you even study for mids and sem exams?

Like do you need notes or do you get some ppt or pdf from teachers?

Any senior please help me on this you would do me a huge favour.