Hey Shravan!
After finally submitting the application form, the official website displays a text which tells the applicant about an editing window. This "window" is actually a duration of some days, wherein you can edit your information. Any changes to the information,after the final submission of course, before or after these days will not be tolerated.
If you have missed this editing window then there is a very little possibility of you being successful in getting the edits done.
You can always try contacting the NTA for help, maybe they will provide a solution.

https://jeemain.nic.in/WebInfo/Public/View.aspx?page=80

Shravan, I will give you step by step procedure to do the necessity.

• Go to the official site. 
• Log in with your application number and password.
• After login, the details filled in the form are displayed.
• At the end of the page, a link with Edit Application Form is displayed.
• Go through the form carefully.
• Once you finish editing your mother's name recheck all the details.
• Submit only when you are satisfied that form is now correctly filled.
• When the form is submitted after correction, take a print out of JEE Main 2019 application form correction slip and keep it safe.

Feel free to ask if you have any more queries.

Hope this helps!

All the best!

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