yea sleeping is good, i recommend that you study maybe from 9 am - maybe 12 pm, then take a break and have a good lunch, and then take a walk or something to relax, and then study again from 1-4. then now you have 6 hrs of studying either all for 1 class, or you might have split up the time amongst more than 1 class's exam. then you could take a nap from 4-6 perhaps and then have dinner, and then you could study from either 7-9 or 8-10 depending on when you finish your dinner. so thats a total of 8 hrs of studying that day, and then you could go check fb or something if you want or play some late night cod until 12, and then sleep for 8 hrs because thats good for you, and you could continue with the shedule and get up at 8 and do your morning routine and have breakfast and study from 9-12 and so on...
p.s. if you think a nap is not necessary, you could relax by playing some video games or have a nice snack or watch some tv or go on fb and procastinate :p