Map deadlines first
Place tests, assignments and fixed commitments on a calendar before deciding how many study blocks fit.
Use active study tasks
Specific tasks such as practice questions, recall from memory or explaining a concept are easier to schedule than “study chapter.”
Do not plan every free hour
Travel, meals, sleep, exercise, family time and unplanned schoolwork all use capacity. Leave margin.
Ask for support early
If workload or concentration problems are making school consistently unmanageable, talk with a parent, guardian, teacher, counselor or another trusted adult instead of relying only on productivity techniques.
This site discusses planning and work habits, not medical treatment or diagnosis. Persistent attention, sleep, stress, or health concerns deserve support from a qualified adult or health professional rather than a productivity hack.