Hello,
Computer based mode for jee mains can be the best one because you don't have to waste any time on omr sheet and also you can edit your response.A sheet of paper will be provided to you for your rough work.You can start from any of the three sections.you have to tap on the next button to get next question.For more details i suggest you to visit the below given link:
http://www.jeemain.nic.in
All the best!:)

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