College exams will likely require you to recall and think critically about more material than you can study in one all-night session. On top of that, researchers have found that students learn more effectively by spreading out short study sessions over multiple days or even weeks than in one or two lengthy sessions. The baseline recommendation for college test-preparation is that, at minimum, you adopt a 5-Day Study Plan.
With a 5-Day Study Plan, you set yourself up for success by starting early and pacing out your study sessions in a way that maximizes your learning potential so you can do your best on your exams.