Hey Saurav

It totally depends on your college. Most collegs (like mine, CURAJ) would have allowed you to leave and given you your tc and character certificate etc so that you can go forth with neet(most colleges do that). You have to write a mail to your administration and ask them how to proceed forward with retrieving the documents you submitted during admission procedure. In our college we go to the student co-ordinator and he dictates what to do next. Try contacting someone from your administration. All the best!