The answer is both Yes and No. There is no harm to join the coaching to learn the basics. However, if you depend completely on coaching, it does more harm than benefit. It may be a necessity for those who are at beginning of their preparation.
There is no such Best Coaching Institute. You should choose which coaching caters to your requirements. It differs from person to person. It is always better if you do some groundwork before you decide. But coaching does not do justice for all subjects. So take coaching for those subjects where your knowledge is weak.
Online coaching saves traveling time. But the one-to-one correspondence does not exist. It also requires a working internet connection and a laptop/desktop/mobile. You may not get motivation in a few cases if you are alone. Offline coaching involves a traditional classroom. It has one-to-one correspondence. Sometimes, faculty don’t maintain time sense.
However, Working professionals cannot spend much time in offline coaching. So Online coaching is better if you want to prepare for a government job while working. But Offline coaching works for you if your sole purpose is preparation for a government job.
Coaching is not required to crack any government examination if you have a perfect strategy. However, guidance, i.e. a broader framework to achieve something, is needed for anyone. This is exactly what you should do. This is where we help you to get a government job.