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.
Depending on your body size marijuana can stay in your system from 15 to 45 days. Also if you sweat or urinate frequently it can clear out your system faster. However the one set amount of time that is just about 98 % true is 30 days for the average sized person..I'm sorry but do NOT listen to this poster.After smoking for the first time, if you consume a few glasses of water it will be COMPLETELY out of your system in 3 days.owever the one set amount of time that is just about 98 % true is 30 days for the average sized person.. I'm sorry but do NOT listen to this poster. After smoking for the first time, if you consume a few glasses of water it will be COMPLETELY out of your system in 3 days.