Question

What is the difference between Roll number and registere number

Answer 1

register no.is the no. which is written in the register
A roll number is a number which is ours

Answer 2

hello dear..................................

Registration number is issued after you fill up your form while form number is issued by UPSC while issuing the form.
you will get form number in offline mode of exam.
if you fill your form online you will be alloted a unique number called your registration number
when you go for e-admit card you can type in your registration number and other details and get your admit card

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hope this would help you
@Rohit