Here are some important points to keep in mind:

Use of Black Ballpoint Pen: Candidates were typically instructed to use a black ballpoint pen for filling in the circles on the OMR sheet. Using any other type of pen or pencil was not allowed.

Filling the Circles Completely: Candidates were advised to completely fill the circles corresponding to their answers with the black pen. Partially filled or shaded circles might not be read correctly by the scanning machines.

Avoid Overwriting or Stray Marks: It was important to avoid overwriting or making stray marks on the OMR sheet, as these could lead to incorrect reading by the scanning machines.

Follow Instructions: Candidates were urged to carefully read and follow all the instructions provided in the examination booklet regarding marking the OMR sheet. This included guidelines on how to mark responses, how to write the roll number, and other relevant information.

Please note that policies and instructions may change from year to year, and it's crucial to refer to the official JEE Main website or information provided by the examination authorities for the most up-to-date and accurate instructions regarding the use of pens on the OMR sheet for JEE Main examinations.

To get the most current and accurate information about the policy on using pens on the OMR sheet for the JEE Main examination, I recommend visiting the official website of JEE Main or referring to the latest information provided in the exam notification or any official communication from the organizing authorities.