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 can stay in the system for as little as 36 hours, but as long as 3 months depending on your body's metabolism. ChaCha! [ Source: http://www.chacha.com/question/how-long-does-one-hit-of-weed-stay-in-your-system ].arijuana can stay in the system for as little as 36 hours, but as long as 3 months depending on your body's metabolism. ChaCha! [ Source: http://www.chacha.com/question/how-long-does-one-hit-of-weed-stay-in-your-system ].