no not important.
Coaching guides u a bit, removes ur doubt, motivates n brings competitive spirit in u.
So ppl go for coachings.
If u think u can do it urself no need for coaching.
N i dont thnk theres a need for fiitjee, vmc etc..
u need tution for above mentioned things where ever u get those u may go there or if u get at home then no need for it..
I hope u got my point. Any coaching institute will not make u study.
Basically u hav to work hard and study chapters on ur own befor their classes are in any coaching to enter into jee..
So its upto u 2 choose ur path.
Plzzzzz approve my answer!!!!
BEST OF LUCK!!!!!!!!!!!!!!!!