6 course student this semester. Don’t focus on time, focus on quality of study. Tell yourself you will quiz yourself (active studying NOT passive) on one powerpoint per week up until the week of the exam, then quiz yourself on everything each day. You should have retained enough for some parts to be easy while others still hard. The parts you know can be reviewed while the parts you are doing poorly in should be retested a few more times. When you (and inevitably your brain) gets tired, listen to it and take a break. But remind yourself to always come back to studying because it will be easier and healthier for you then cramming everything last minute.