It may be difficult to find out whether you have an IMM India account. First, search for "IMM" in your email account. You may have account information listed in your email. If you live nearby, you could try calling or visiting the school, along with several forms of personal identification, to see if they can locate an account with your name. You can go to immindia.com for contact information.
To find out if you have an IIM account you need to contact your local Office of the Special Trustee or OST. When contacting the office tell them you want an IIM ledger report. This report will inform you if you have an account.