Hii Raj!

If you haven't joined any College or Institute in between these four years, then, you need the basic documents mentioned by the College at the time of admission. But, if you were enrolled somewhere else in these 4 years after class 12th, you will have to produce a migration certificate or gap certificate ( in  the  form of application ) from the college or institute and submit at the time of admission in AMU. The basic documents required are id proof, class 12th marksheet, transfer certificate, leaving certificate, eligibility certificate (if needed) etc.,

Hope this helps.

Good luck!