I gave my JEE mains xam dis year n dont think I'll b able 2 get through. Can I drop an year n do b.sc n do prep for 2nd attempt for Mains

I gave my 1st attempt for JEE mains bt I'm getting only 85. Im expecting 85% + in 12th should I drop an year. N if I take admissions in b.sc will I get enough time to do preparations for engg. Plz help. N with the given marks can I get admission in a gud engg college dis year itself. I got 95% in 10