Hello aspirant,

It's never too late to start anything. So, you can join allen even after your class 12 for you jee preparation.

But keep this in mind, that don't waste that second year after class 12. Be focused on your ambition to crack jee exam .

Also you can check the below article to know the complete details on how to crack jee mains and its preparation tips to study well :

https://engineering.careers360.com/articles/jee-main-preparation-tips

Good luck.

I hope that it will help.