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It is important for candidates of JEE Main 2019 to have an Aadhaar Card  while fillinf application form because while filling the application form of JEE Main 2019, candidates will have to provide their Aadhaar card number, name, date of birth and gender for identification and authentication purposes. You must ensure that the details provided in your Aadhaar Card matches with that of your school records.

All the best.