What's the best methods to increase perfomance when i have university exam on 3:30 pm while i wake up every day on 6 am cafeinated beverage not enough?

Good sleep!: The best method to increase performance on exams is to make sure you're getting consistent sleep before the test. Please don't pull all-nighters and expect that caffeine or other stimulants will bring your thinking and memory up to par. Also avoid hard partying with alcohol or other drugs. For good sleep hygiene specifics, see: http://www.Umm.Edu/sleep/sleep_hyg.Htm.