Hi Arnab,

Congratulations first of all for your good score!

According to your expected marks there are very high chances of getting admission in any IISER you want. It depends on your preference given in the application form that which IISER you have placed at top most so according to that IISER will be offered to you in first round if you are not happy with the offered IISER you can choose the float option and then next IISER will be offered to you in next round and if you are happy and satisfied with the IISER offered in first round then you can choose the freeze option. So don't worry be happy and enjoy your time you will be definitely be studying in IISER a National Importance college soon.

Good Luck!