Hello

Its ur own choice your board result is excellent but your jee main percentile is very low. If you are living near noida then there are many colleges . you can check their nirf rankings 2020 and select your college. Many colleges give admission on basis of board results.

And as far as for jee main in september you can also wait for that  . but it depends on you whether you will get best percentile or not . If you are pretty sure then you can wait otherwise you should take admission in best private college in  noida . The private colleges in noida are much good than NIIT and Some of IITs like Amity University Noida, Shiv Nadar University , jaypee university etc . You can also get scholarships in these private colleges. So all depends on your choice.

All the Best.