prepared Aiims exam now class 12th but my preparation very poor suggest me this few months how to mast prepare for best rank

Below are the important topics for AIIMS



Biology:  Systematics, Genetics, Cells, Ecology and Human Health & Diseases are especially important.



Chemistry: General Organic Chemistry (EXTREMELY IMPORTANT), Hydrocarbons, Equilibria, Bonding etc. Also, be very thorough with reactions of p-block elements.



Physics: Modern Physics, Waves, Heat and Thermodynamics, Ray Optics etc.



You can refer below study material



Physics:



CBSE PMT by P. Aggarwal (set of 3 Volumes)

HC Verma (Volume 2)



Biology:



Pradeeps

Truemans Biology (Volume 1 and 2)

AC Dutta for Botany (Oxford Publication)

MTG (Biology Today) CBSE PMT (magazine)



Chemistry:



ABC Chemistry

Organic Chemistry: Arihant Publications, Morrison Boyd

Physical Chemistry: Peter Atkins and Julio de Paul

A New Pattern Textbook of Inorganic Chemistry for Competitions by O P Tandon

Objective NCERT at your fingertips Chemistry by MTG



You can also follow below strategies



-There are 20 questions based on general knowledge in AIIMS exam. For solving these, you can read newspapers and watch news everyday for an hour to have the best idea of the latest events happening in order to get along with the General Knowledge part in the AIIMS 2017 exam. Other most recommended GK books for AIIMS include General Knowledge Today and CSR magazines.



-Utilize the time to understand the concepts through NCERTs. Prepare flashcards for formulae and equations for Physics and Chemistry while make diagrams and flowcharts to understand Biology concepts. These methods help you immensely while memorizing lengthy concepts.



All the Best!!