Hello!
Category should have been mentioned at the time of filling application form. For the candidates who made a mistake while filling form, NTA had opened a correction window for the candidates who took JEE Main 2019 exam in both January and April Session, to make changes in their 'Category' detail along with uploading necessary documents required. The correction facility was closed on April 17, 2019 at 5:00 p.m.
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-application-form-correction/amp
Now, the JEE Main 2019 (April Session) results are also declared so it is too late, as changes in category takes time to be processed and it is not something which can be approved sooner. NTA won't offer any such correction facility for now. 

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