make a detailed schedule and simply stick to it...
i.e. i follow algebra and for each chapter we made some exercises; for the next week i've planned each day 1 chapter; in the morning i study the theory and in the afternoon i make exercises....
i have 2 days to spare if i stick to the schedule so i'm on the safe side...
at least thats what i do...
+ if you study hard and reach your deadline for the day early you reward yourself by still having a whole evening to do stuff ! yayyy !!! :D