How to quickly prepare for the exam?

Before the exams, I started to take smart pills nootropicboost.com/buy-best-nootropic-stack/   . They helped me  better to remember and be more concentrated.These pills is cognitive enhancer.  I feel vigorous, although I didn't sleep more than 6 hours before the exams. I also noticed that my dream became more calm. I go to bed and wake up at the same time every day. I started to meditate before going to sleep and every morning I start with yoga and not coffee.