Hello aspirant !!

First of all I'm feeling good since some of the students at your age don't even know about aiims and you has interest in preparing for tha t exams. Kinddlyake your basics strong so that you can focus on the advance studies keep going with ncert if you are full thorough with ncert you can go with mcq books such as mtg and other publications.

https://www.google.com/amp/s/medicine.careers360.com/articles/how-crack-aiims-mbbs/amp

All the best!!

Stay safe!!