Got 96.5 in mains, should i prep for adv only? Dasa/ciwg student

I did some adv prep in 2 years, not much, but if i study 11-12 hours for 2 months till adv, is it possible for me to get mnc or cse in low-mid iits? I have a backup college as im a Dasa/ciwg student, nits are at easily possible at 96