On the IBPS login page, look for the ‘Forgot Registration Number’ link and retrieve it using your name, date of birth and registered mobile number.
Check the email you used at application time — IBPS sends the registration number in the confirmation mail.
Once you have the registration number, log in and download the admit card from the IBPS website.
If retrieval does not work, contact the IBPS helpdesk with your personal details.