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An applicant cannot change the preferences of JEE Main examination center once the application is submitted. The details such as personal details, category, language of paper, State of Eligibility, state of eligibility, choice of paper and academic details can be changed/corrected when the correction window is available. The correction window for JEE Main fourth session had been closed on July 20, 2021. As there is no provision to change/modify the examination centers for JEE Main Entrance Examination you cannot modify them now in any way.