Dropping  ayear is seriously not recommended, as it can have serious repurcussions once you graduate and go for job interviews where you need to showcase your year gaps.

With persistent efforts and dedication to study atleast 7 hours per day and working with passuin will deefintely guarantee you decent score.

So advisable to study alongwith 12th and not go for dropping a year.

Some best preparation tips which can help you in achieving good score without dropping shared below,

https://engineering.careers360.com/articles/jee-advanced-preparation-tips-physics-chemistry-and-mathematics

Expert Tip:

Analyse Mock exams to identify weak areas and devote timefor solved problems from the books on such topics, try to revise them regularly such that your weakness becomes your strength.