Section of roll number should not be blank otherwice software will not detect the roll number.

it should be like this.

it should not be blank like this.

Square should be done only and only by using HD dark pencil,or by blue or black pen not by ordinary pencil.

Square should be fully filled, no any white part should be left inside the square.

Some patterns of filled square are shown below. Right and wrong patterns are there.

This is incorrect way of filling the MCQ sheet as underlined character is seen below.

incorrect_way.pdf

This is correct way of filling the MCQ sheet as underlined character is not seen below.Dark the square properly as seen below.

correct_way.pdf

Here is the photograph showing incorrect vs correct way of filling OMR sheet.

following image is showing wrong method to fill roll number. do not do this.