i am a student of class 12. i have very weak memory ,, though i have completed 12 class course but i have
forgotten many important concepts

so how should i manage both class 12 and jee exam

Hello Student,
This is the case with many student. Its difficult to remember so many concepts.
Stratagy for this could be revise the concepts you feel you are week at. Take timely test and anlyse yourself, find out your weak areas and try to improvise upon it.
At the end understand that this is a gradual process and it cannot come in one day or two. So keep doing good work.

Thanks,