Hello Gaurav,

Yes, JEE Main correction form is for all students who have applied for April attempt. The application form correction opens for the candidates as an opportunity to correct or change any details that they wish to after the submission of the application form. Application correction window will be opened from 11-15 March 2019.

If a candidate thereafter is found to have provided the wrong data, their admission might get affected. 

For more queries you can write us.

I hope this helps.