If you are well prepared with class11th & 12th syllabus then it is easy to crack the exam, From class 11th you can be well prepared for the exam.

To score good marks in AIIMS make sure your basics are clear. You can take  help of NCERT books to build your concepts and make your fundamentals strong.

Make your time table- You should draw a time table subject wise & strictly follow it. During your preparation note down also the important thigs it will help you at the time of revision.

Below is the subject wise preparation

Physics- This subject tests your analytical skills. The physics questions in the AIIMS exam are advanced, but if your concepts are clear, then you can easily solved it. Practice as many Assertion & Reasons questions as you can.

 
Chemistry – In the past, most of the questions have been NCERT-based. Hence, refer to NCERT books for practice.

 
Biology – Follow first NCERT then prefer the other books.

General Knowledge – You should read newspaper and magzines for your knowledge.

You should refer previous year papers to understand the exam pattern and level of questions. Solve as many as mock test series to know your strength and weakness. So, you can work upon them.

Good Luck!