40 days are not enough, but certainly a lot can be accomplished and it might be turn the result in drastic way. Last days are highly important. The attention span is more.
- If you have studied entire year and made notes, revise that. Make a crisp timetable, alotting time to each subject and do fast revisions.
- New things can be learnt, but avoid them in last ten days.
- Give atleast 1 test everyday. Mock test/grand test. And then read the mistake and left out questions.
- Solve soem MCQs everyday of whatever subject you read that day.
- If you haven’t already, start making a diary of things you need to revise a day before. Like formulaes or values.
- If possible complete entire course in 20 days, then revise it again in next 20 days. Last 20 days you should study only the marked/imp lines.