Hello ,
As your query is concerned that you want to know after taking admission in IITM , Gwalior when the college will start with it's new session. I would like to tell you that your date of admission has nothing to do with the start of new session and it's session, it all depends upon the institute and their management but based on analysis somehow the date will be after 20th of July which is that is the date near which each and every college start their session with the new semester but if you need this detail as an important mark then you can communicate with the college and they let you know the fixed date as per their concern because that may change or may not but it is only known to the institute.
I hope your query is solved.
Thank you.