Is it necessary for a candidate to register at COAP?

Yes.

When will I get a refund for a failed transaction?

Kindly check with your bank for refund status.

I have three valid GATE scorecards of GATE 2022 / 2021 / 2020 for the same paper. Which score card shall I use?

It is advisable to register with information related to the highest GATE Score.

What to do if i have any other queries?

Please contact pgadm@iitpkd.ac.in.

I have registered on the COAP portal in 2020 and/or 2021. Do I have to register again?

Yes, you have to register again. COAP 2020/ 2021 registration is not valid for COAP 2022.