Hyy,

Hope you are doing well!

I think opting for Bsc is not bad at all as it will act as a backup plan. But if you are really interested in engineering then i would suggest you to drop a year and prepare thoroughly for the exam. Considering the fact that most of the students at top IITs and NITs are droppers, dropping might be a good option.

You can take the career360 JEE mains Knockout course as it has best lectures and modules. Here's the link to that.

https://learn.careers360.com/knockout-jee-main-subscription/

Hope this will help and i wish you best for the journey ahead