Hello,
Joining  bsc college is good idea as it acts as a backup but it gives you a thought that you are already in college (i.e time is wasted in college examinations , attending classes etc).

Dropping a year for preparation is very common as the competition in JEE entrance exam is high. More than 60% of students at top IITs and NITs are droppers.
Dropping a year doesn't matter at all in long run provided you study hard this year get into a good engineering college next year.

So if really are interested in engineering, you should take an year drop and prepare thoroughly fot the JEE exams next year.

You can join careers360 knockout for JEE and prepare online as it provides you with best lectures and exam pattern question modules.
for more information about careers360 click on the link below:

https://learn.careers360.com/knockout-jee-main-april/?icn=jee-knockout&ici=learn-home-banner

Hello Aspirant,

Mu suggestion woud be take complete drop and study properly for jee mains next year. Taking Bsc will divert your focus as you will have to submit assignments and give tests for Bsc. Complete drop will keep you focus at one thing. Do practice ,give mock test .Do check the link below for books from where you can practice better:

https://engineering.careers360.com/articles/best-books-for-jee-main

ALL THE BEST

Hope it helps