Using this semester calendar, break up the big tasks. Try to study for the same course at the same time and day each week. If you set aside one and a half hours on Monday and Wednesday evenings to study or complete assignments for a class that meets on Wednesday and Friday, you will have enough time to study more completely or proofread and rewrite assignments. Plan short breaks in your schedule every 20 to 30 minutes. Concentration falls off rapidly after a certain amount of time and you will get the most from your study time if you get up, walk around, stretch and breathe before going back to your studying.
Plan longer breaks with rewards built in after a completed study session.
Use these to motivate you to finish an assignment or complete a study session. Do not allow yourself to enjoy these until you have earned them. This will help you to finish what you had planned in the time allotted and the rewards will seem that much sweeter. Realize that there are fixed comittments over which you have little or no control. Arrange the rest of your week around these.