Previous year question papers -
Refer to some Previous year question papers of AIIMS, at least 10, and note down which topics and subjects are important and which are not.
Prefer Class XI and Class XII syllabus -
As the syllabus mostly is drawn from that of Class XI and Class XII of the CBSE board, you may not face many problems in completing your syllabus.
Focus on the important subjects -
Focus more on the important subjects and topics only. Even you can neglect unimportant subjects and topics.
Mathematics is indispensable –
However, the sections of the AIIMS entrance exam largely consist of biology-based topics, so having a background in mathematics is still important.