Hi there.

The medical colleges in West Bengal take some required documents for verification purposes during time of admission. Verification is a very important part of the admission procedure in all colleges. 

The authorities never keep the original documents with them. For verification they see the original documents and if required they take the xerox of those documents for future reference. They put up the seal of the college on the original documents. The documents are returned as soon as the verification process is complete. 

Hope this helps.