I am a 2016 BTech Graduate from a Tier-3 College. I got an offer from IIT Kgp for MTech CS in 2023 in eighth round on 5th July,2023. I have not received my offer letter yet. I am working as Oracle Application Engineer with 7 years experience. Tentative Joining is from 21st July. My current employer notice period for 1 month is not flexible. What should I do, please help?