Vicky, OMR sheets are scanned by the machines, so a small mistake during filling OMR sheet might result in deduction of your marks. You need to fill the ovals in OMR sheet only with blue or black ball point pen. Also, the instructions to fill the sheet would be available during exam. To know more, kindly visit our page at

https://www.google.com/amp/s/design.careers360.com/articles/nift-exam-pattern/amp

Good Luck