As you have asked about the tricks to crack the All India Institute of Medical Sciences (AIIMS) MBBS entrance exam, I am giving you information about it, check below for the details

Firstly you should know about the exam pattern of the Entrance test

Number of questions (200)
The online questions booklet of AIIMS MBBS 2016 will have a total of 200 questions from
Physics,
Chemistry,
Biology (Zoology & Botany)
General Knowledge

Firstly you should prepare a time table and follow it religiously.
Cover all the topics but cover important topics first.
You can solve previous year papers.
You should try to increase your speed.
Practice the questions in which you face difficulty.
You can also enrol yourself in some test series.