Dear Agrima

ALLEN CBT is the computer based, country-wide test conducted by ALLEN to help students practice for the entrance exam. It conducted AIIMS CBT in two shifts on May 12 and 21, 2018. The exam pattern was similar to the AIIMS MBBS entrance exam. 

You could apply for the test from the link given below. 

https://dlp.allen.ac.in/apps1718/AIIMSCBT/Login

Good Luck!