B.Ed. Colleges and RTI Act

You can get information pertaining to private entity (private schools, colleges, coop societies/banks, private sector banks and insurance companies, public/private trusts, private service providers, public limited companies etc) under section 2 [ f ] of RTI Act.
Please follow this procedure.
1. Find out the government dept/regulator with which the private entity is registered or is being controlled or monitored by.
2. Locate PIO (Public Information Officer) of this government dept/regulator, by visiting concerned website.

i have already submitted all the documents in that college.

No, once you get admission to any college under a certain university for the purpose of doing B.Ed. after getting the release order from school (You have been released to join a particular college not any college.) you cannot change your college. As you are saying that you have already submitted all the credentials including the release order, how can you acquire the same (from your school) for the second time for the same purpose?

Even if the college provides you the release order, how can you get the release order from school? If the present college releases you, you will have to submit the same to your school first, not to the college you are anticipating to get admission as you were initially released by your school to join that former college. Now again, if you submit the release order to your school, the period of deputation will get a premature termination which actually happens as per the existing GOs on 30th June. Then, your school will have to go through the same procedure for the second time which once accomplished is not allowed in the order regarding deputation. Remember one important thing, your admission form/procedure was duly countersigned and approved by the concerned D.I.(SE). How can you do that for the second time ?

….And the days you spent in your B.Ed. College (where you already get admitted) is to be shown as leave (ML or any kind of leave admissible to you) or you have to sign the daily attendance, if your school permits.

To continue with @gpgarain I believe no school will allow a already deputed candidate having attended some classes in a B.Ed. college to sign the daily attendance for that will be documentation of presence of the same person in two different places. Isn’t it Garain Da?

Of course it is.
I just said of a possible way. But everything depends on the school.

Yes, that could be the only possible way.