Generally speaking, taking the coach's license requires a certain level of tennis skills. Because of the teaching requirements, all skills should be comprehensive. First of all, the ITF coaching certificate is a three-level coaching certificate from the beginning. It is difficult to apply for the first-class certificate, but training means training a skill before taking the exam. If you are not good at serving and volleying, you can practice more. You are young and have a strong learning ability. You should be able to pass. Good luck.