I don't have migration certificate, I have to go to college(SRM university) next week to provide all the documents for enrollment . with they give time or we can provide any alternative until we provide them migration certificate?

Migration Certificate is a document issued by the concerned University or Board in which one studies. It helps in getting admission to another institution or any education board and it is issued at the completion of the course along with other necessary documents. You can contact the authority of the college you are taking admission and can apply for a delay in submitting the certificate. The thing is that migration certificate is a mandatory thing when you take admission. But you may get a consideration if you conducted your college authorities you are taking admission.
Leaving certificate is a mandatory document to be provided if you want to get admission in a university abroad or in India. A migration certificate is necessary when school students have passed their class 12th exam or graduation successfully and he/she needs to get admission to college or university to seek graduation courses.
Migration certificate is required to take admission in any university as it indicates that you are migrating from your college to university. It will be required even if you completed your 10th and 12th from the same state as of your university.