When a college is allotted you through any round of counseling you have to report to that college within 3 days of allotment. You have to reach the college with all the documents' original copy. Though some college might give you some concession with some other documents, however for a document like a marksheet no college would allow you further through the admission process and will cancel your allotted seat. Documents like marksheet, OBC certificate, Income certificate, etc are considered to be of utmost importance. I suggest you should immediately contact your school administration and seek out their help in the matter.
