HELLO RAJAT 

QUALIFICATION IS ALWAYS ABOUT SENIOR SCHOOL EXAMINATION. SENIOR SCHOOL EXAMINATION REFERS TO THE BOARD IN WHICH YOU ARE STUDYING AND INTERMEDIATE SCIENCE ALSO REFERS TO THE SAME THING BUT SENIOR SCHOOL EXAMINATION IS A FORMAL WAY OF ASKING.

Hey rajat , Greetings!!

AIMS eligibilty criteria is you must have passed your class 12th under CBSE or intermediate science from a recognised board from any state with english , physics , chemistry and biology as main subjects .

For AIIMS you must have secured minimum aggregate marks in english , physics, chemistry and biology:

General and OBC-60%

SC AND ST-50%

PWD-45%

Moreover , AIIMS final registration has already started from 22 february and ends on 12th march 2019. In order to complete the final registration of AIIMS MBBS 2019, you can click on the link on its offical website and submit your registration ID, unique code, password and displayed captcha code. 

all the best!!