An exercpt form an article about the same :-

 The candidates who took JEE Main 2019 exam in both January and April session can make changes in their 'Category' detail now. The correction facility will close on April 17 (5:00 pm). however, NTA has closed the one-time normal facility to make corrections in JEE Main 2019 application form (April session) on March 15. Using the application form correction facility of JEE Main, candidates could correct a host of details in the application form, except for the change in exam cities. If applicable, candidates have to make additional fee payment during application correction dates. The payment can be done till March 16, 2019 (11:50 PM).