Hey there

You can change your exam city centres as per your preference when JEE mains will open its correction portal. The correction portal will be available from 11th of October to 17th of October.

Check about JEE mains correction

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jee-main-application-form-correction/amp&ved=2ahUKEwinqM2okM7kAhXE73MBHSj4BwMQFjABegQIDxAH&usg=AOvVaw1s_HFC5XlL5HB_za3JPO-b&ampcf=1

Good luck

Hey!There.
Yes,you can change your centre even after submission of application form..You can change your paper,centre, personal details etc.. Correction window will open from 11th October..But for changing paper or centre you have to pay extra charge for rectification..
Ask if any query..
GOOD LUCK!

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