Hello,

Yes,U can appear but first u need to pass 12th board exam which is supplementary exam and u can appear jee mains for 3 times.So if u fail once u should prepare for supplementary side by side u need to prepare for JEE mains.

Hello,

You can appear in JEE Main for three consecutive years. So if you are going to appear in supplementary exam this year and pass you are eligible to get admission based on JEE Main score provided you must qualify in JEE Main. If you are appearing in supplementary exam next year then you cannot appear in JEE Main September session but you can appear in JEE Main 2021 for that you must pass in the supplementary exam next year.