Hello Ria,

If you got IITM in first round and want VIPS you should not freeze your seat after 1st round. Chances of getting VIPS totally depends upon your rank and cut-off. And chances of getting back IITM depends upon your preference list. If you want IITM back then there should be only VIPS above the IITM in preference list. If there is any other college above IITM and it's cut-off rank is more that your rank you will get a seat in that college but not in IITM back

Hope this helps!