Coaching institute can be helpful for preparations to some examination. The reason behind is that you will get mentors who have qualified or who have observed the examination over the year. From there experience they can guide you out the important topics and sub topics, the strategy with which you should study, necessary books etc. So some of the crucial points the student gets ready made, as a result the only work he/she have to do is studying in the strategy. Also if you go for the coachings, then you will get the study material and practice test. Also you will be among the students, which will give you a competitive mindset. So if you wish you can go for coaching. Its not necessary to think that without coaching you can't qualify. If you want to go without coaching, then the thing you must look for is your sincerity.

Its completely your choice to go for it or not to go for it.

Goodnight!