It depends on your usual performance. If you are confident and often speak in public, you don't have to report it. If your language organization ability is weak, you are easily nervous in the interview and your mood can't be adjusted, you'd better sign up for a class. After attending special training, you will at least feel much better.

In any case, it is better to sign up for a class than not to sign up, but it needs capital investment. Airlines have lower prices and better reputation. You can learn about it. Good luck!