Hey

It doesnt matter if you have studied from cbse, isc, state board or nios you need at least 75% marks in aggregate or fall in the top 20 percentile of Class 12 ^th qualifying exam of your state or central board of education to be eligible for JEE Main 2020(general category). NIOS candidates also apply for this exam with the same percentage requirement. even Higher Secondary Certificate Vocational Examination students are eligible

All the best.