1 Make studying a regularly-scheduled part of every day. 2  Study difficult subjects and those you do not find very interesting first, when your energy level is higher.  Be aware of your best time of day when you are the most alert, and use this time for studying.
Loading ... about 2 days contents of a 250ml cup of coffee. It only takes you two hours to process it trough your system if you weight 200 lb, you will loose 50% of it on your first urine, but it does not clear completely out of your system for about two days.
Marijuana Stays in your system for 31 days.cocaine however will only be about a week.barbiturates will only stay 1 day, where as opiates stay about a week, except they take 1-â¦ 3 days to appear on a test.stimulants stay in your system four days, and methamphetamines will last about a week.