Dear aspirant !

Hope you are doing great ! You are asking for jee mains first attempt ,right? Then if you have submitted the obc caste certificate of 2018 then yes it will get rejected ,not your form but your certificate only ,there will be also no correction window this time . You must take care of that before , now you will be treated as general ,also you might submit declaration form but you didn't that's your mistake.

For more information about jee 2022 ,visit the link---;

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jee-main-2022/amp&ved=2ahUKEwjyjJ3C6MX2AhUMdt4KHfPXB-YQFnoECAUQBQ&usg=AOvVaw0MK_nHUuH-7yTGxus_3sLb .

Hope it helps you !!

Thank you