You may have been able to slide through HS with your charm and smarts, but college may be different. For example, participation for a grade rarely counts in college. Being able to test is a real skill in college. Reading and doing homework is necessary now.
Don't pride yourself on operating on no sleep. Break that habit now. Getting run down can cause you to get sick and miss class --> which leads to NO makeup time. That doesn't exist in college.
Tip: Spend 5-10 min now and your brain will be tricked that you might actually like the assignment later.
Repetition will help you learn. Review your notes after class, even if it's just for 20-30 minutes. It will help better prepare for exams so you don't feel like your cramming.