Dear Aspirant, as right now you are in 12th standard it is necessary to focus both on the school result as well as on your future. Since you want to prepare for AIIMS exam. If you want to prepare offline then you should go for the best AIIMS/NEET coaching in the country i.e. Aakash. Aakash Institute has a good record of students clearing aiims exam. It is considered as one of the best institutes for aiims. But hey, it also depends on the branch so the teacher differs in every institute of Aakash. So you should go for the best branch of Aakash in your city.
Whereas, if you want to prepare online then you should visit the link below for syllabus, exam pattern and model question paper from previous years:-
https://medicine.careers360.com/articles/aiims-previous-year-question-papers
Hope this helps and all the best for your future endeavors!!
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