Hi aspirant.Most of the questions are from a few chapters and topics. The important topics for the last minute revision of aiims are:-

a) Physics:

Electromagnetism(all the chapters)

Modern Physics (focus on semiconductors and communications)

SHM and Waves ( including wave optics)

Force

b) Chemistry:

Chemical Bonding

Atomic structure

General Organic Chemistry

Electrochemistry

p-block

c) Biology:

Genetics

Reproduction (Humans and Plants)

Mineral nutrition in plants

Five kingdom classification (focus on plants)

Ecology(all chapters)