Don't schedule marathon study sessions. The time on task can be very small if you schedule blocks of time that are too large. Several shorter sessions are likely to be more productive. Use the time between classes productively. This can reduce your nighttime study load a lot.
Some students approach school as a full time job.
They schedule a eight hour day with meal and coffee breaks. Then they do not need to spend their entire evening and weekend studying. Set up a system of rewards f or reaching a study goal. For example watch your favorite situation comedy if you complete your calculus assignment. Problem Solving Skills Identify what the question really is, or what is the fundamental issue.