Opinions - best for study period before exams?

SWIM has exams starting in january and has the holiday period off to revise for said exams. SWIM is looking for a good legal study aid. SWIM has found a site that delivers various legals to the UK and has seen adrafinil and others availible.

SWIMs main problem is that he cant sit down and study for more than around 15 mins without getting distracted surfing the web etc. in a day 4 hours would be set aside to do revision before dinner and that time would disappear easily without even reading a page or 2. so need abit of stimulation and focus etc


what SWIYou use? if no access to illegals is availible?
study will be for roughly a 30day period. Dosage would likely stop completly after the exam period aside from the odd-last minute essay writing.