Hello Adarsh,with your Gate score your chance of getting any seat in COAP counselling is quite less,but if you are not very much determined to be admitted in IIT then I would suggest you to go through CCMT(Centralized Counselling for M Tech) though the dates are over,but with your Gate score just go through the process so next time you can be aware of it.

If you want IIT then,a little more prep is required and to try again for next year,If you can score 533,then you can score more than that.

All the best!!