You can visit jee mains website and can choose another examination centre for your jee mains exam after logging in into your account.You have to update it as early as possible only till 1st January 2018.However you can pay application fees of jee mains till 2nd January 2018.
Good luck:)

Dear Aditya
That's fine. Just try to login tomorrow once and select the different centre. If the problem persists once again then you can have 2 options:
You can reach JEE main team, by using contact us in the official websiteOr else you can wait for January 4th week, at that time if you are application is having any errors you can correct it.All the best

If you have applied for JEE Main offline exam then you must have given 4 centres. The next one will be assigned. For the CBT, you had to choose and book the slot. If you have chosen CBT, the centre given will be assigned on the next date other than the one you chose.

Now I dont know which mode of exam you have chosen. Can you specify that? 

Please also mail the meassage to jeemain@nic.in and ask them for a clarification. They will also reply. Else write back to us.

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