Is it really neccesary for me to take JEE coaching to crack it?

No, it is not necessary to take coaching for JEE there are many students who cracked JEE without coaching. Guwahati zone has the highest percentage of students who preferred self study for IIT JEE with 61.4% opting for it while Madras with 39.4% has the lowest number of students relying on self study for JEE preparation. A region wise break up of those who preferred self study vs coaching institutes for JEE preparation is mentioned below:

Zone/Region Self Study Coaching Institutes

All India 52% /48%

Guwahati 61.4% /38.6%

Kanpur 54.8% /45.2%

Roorkee 55.1% /44.9%

Bombay 52.6% /47.4%

Delhi 47.1% /52.9%

Madras 39.4% /60.6%

Bombay zone, which not only has the maximum number of aspirants of IIT JEE but also a huge commercial coaching institutes network, still has 52% students who opted for self study but managed to crack IIT JEE.

Guwahati zone lacks enough coaching institutes and hence it seems natural that the number of students relying on self study for IIT JEE would be higher. Madras and Delhi are the only two zones where coaching institutes trump self studying aspirants