Hi

You will not be required to submit your migration certificate inorder to get admission in nit durgapur since you belong to West Bengal. If a student seeks admission within the state he may not be required to submit the migration certificate. But to be on the safer side you should carry your 12th migration certificate and not your college migration certificate as certificates required at the time of admission in nits are given on the basis of your 12th certificates.

Do let me know if you have further doubts.

Hope this helps.