i lost my roll number of bob po exam.so how can i check my result?

Hii, do not worry. During filling of application form, the registration number and password might have been generated which would have been sent to you on your personal mail. You can go through your mail and retrieve your details to check your roll number in the result PDF.

You can contact BOB Official on website of Mains Exam regarding your roll nunber.

You can retrieve all your details by giving them all your personal information like Name, College, Degree, etc so they can scan from database and passon all requires information