Analyze your daily schedule and try to prepare a study plan as per the observation. Devote at least 12-13 hours daily for studies and include curricular activities as well to keep the brain fresh.
Take planned breaks for 5 minutes, after every 15 minutes. Longer breaks can be taken after every hour. It maintains concentration and keeps the memory fresh. Stay away from gadgets that can act as a distraction.
While preparing a timetable, try to maintain the coordination between essential/necessary tasks and study. Time-table is a tool that needs to be curated and implemented perfectly. Following a well-designed preparation, the plan provides a guaranteed result.
Keep a notebook and note down all the important concepts and ideas. Revisit them often so that the memory does not fade away.
Recall and jot down a brief explaining the activities done in the last 3 days. This will provide a better insight into the areas and time slots that you can use in a better way. It will also provide an idea of the areas where you have failed in following the timetable and in your daily planning.
Plan your schedule with a proper strategy and break down the subjects into topics and further into ideas. Do not create a vague timetable. Be clear and precise.
Keep aside a month or two for revision and practice only. Solve as many of last year's question papers, mock tests, and practice papers as you can. It will help you in evaluating your performance and kick it up a notch.
Keep in mind to include your favorite activities along with the preparation in the timetable. It can be a great way to utilize the break time as it can help in maintaining the focus and preparation stamina.