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Hello candidate,
At first, the first thing which I would like to suggest you is that you should be very careful while filling up your application form and other registration details for any exam, and specially the reservation column.
If you have by mistake filled up the incorrect roll number in your JEE mains application form, then you can use the JEE MAINS correction window available on its official website to edit your entered details for correction.
Hope it helps!!
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