Making a successful 12th self-study plan requires careful planning and consistent effort. Here are some steps you can follow:

1. Set a Goal: Determine what you want to achieve from your self-study. Whether it is to score high marks or gain knowledge, having a clear goal will help you stay focused.

2. Create a Timetable: Divide your day into slots and allocate time for each subject. Create a timetable that is feasible, flexible and covers all the subjects.

3. Identify Strengths and Weaknesses: Assess your strengths and weaknesses in each subject. Spend more time on the subjects that you find difficult and try to strengthen your concepts.

4. Gather Study Material: Collect all the necessary books, notes, and study materials. Ensure that you have all the required resources for each subject.

5. Set Realistic Targets: Set daily, weekly and monthly targets. Make sure that they are realistic and achievable. Celebrate your success when you achieve your targets.

6. Take Breaks: Take frequent breaks to relax your mind and body. Avoid studying continuously for long hours. Take a 10-15 minutes break every hour.

7. Stay Motivated: Stay motivated and positive throughout the self-study process. Keep reminding yourself of the goals you want to achieve