Hello Praveen!

There is not any kind of problem if you have got question  booklet and OMR sheets of separate numbers. There is nothing wrong in it as Both are two different things so to keep the record of every question booklet as well as record of every single OMR sheets; Serial numbers are given to these things. In this way conducting any exam can be easily managed.

Question booklet are those things in which question is asked by any examination authority.They print a certain no. Of question booklet according to the requirement of examination.So they are assigned some numbers to them to keep track of every single question booklet. Those numbers are called Serial no. Of question booklet.This is one thing which has nothing to do with the OMR sheets.

Nowadays! In Most of the offline exams whether it is school board exams, UG/PG exams, Or competitive exams of any field OMR sheets are used as  answer sheets. Full form of OMR is " Optical Mark Recognition". These sheets are checked by OMR software as the software reads/recognize the mark on one of the options given in MCQs  which is filled by students as their answer. You and the other students have given OMR sheets of different Serial no. In that OMR sheets you've to fill your details right such as your name,roll no., question booklet no. Allotted to you. In this way the authority has a record of which particular student has gotten which Serial no. Question Booklet.

So there's  is not a single thing to worry about.

Best of luck