Hi Aravind!

Yes, you need to submit the inter short memo during verification.

No one takes your certificates during the certificate verification during verification .You just need to submit a photocopy of all the listed documents and pay a registration fee and get your mobile number registered to which a login id is sent the day before the option filling starts.

They just verify your certificates and give them back to you.

After you are allotted a seat you need to pay the fee and accept the seat online and only then your certificates are taken by the college management during the time of reporting physically at the college

Best of luck.