Instead of saying, 'I'm going to do maths from 5 pm to 6 pm,' try making a plan to sit down at 5 pm and complete three tasks. (e.g. revise this flashcard set, do practice questions 1 2 3, write notes on ch 3.) Then you can tick off the tasks as you go along and have an end to work towards. Revision is a lot easier when you have a checklist of things to do rather than just going over everything.
