Hello Divyansh Virag, yes you should change your board as it may create a problem during the time of document verification at the Reporting centre.The correction window was opened from 08/03/2020 to 12/03/2020 but its time has been changed as the time of form filling has been increased, now it will be opened from 12/03/2020 to 16/03/2020. so you should change your board during this time.
The fee of correction window is not fixed, it depends upon the no of change you have made in the form and fee is not mentioned on the website, so the actual fee you will know when you will make change.

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