I have applied for JEE Main 2019 and also paid the fees for it. But I have made a mistake in my application form.
Yes, you can correct your category from OBC to General during the form correction window which is from October 8th to 14th, 2018. You'll have to pay an additional fee for the correction you make during this period.
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Know your college admission chances in NITs, IIITs and CFTIs, many States/ Institutes based on your JEE Main rank by using JEE Main 2025 College Predictor.