How to make a planner for an exam session?

I am usually really bad at managing my time. In my school we have exams 3 times a year. When it comes to an exam session I often find myself studying last minute and I don't like it at all. I would like to start preparing earlier, the problem is most of the time we haven't finished the material util 4/5days before the exam. Our exams are one after another during a week or two. Also, I fear that by studying for the 2nd one I would have forgotten what I learned for the 1st one. + I do procrastinate a lot. Somehow I end up passing the exam with 70-95points, depends on the subject but I pull all-nighters and I'm not doing my best. Does anyone have any tips?
How to make a planner for an exam session?
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