The future champions???

Tow weeks ago, I was selected to teach english in a ping pang ( table tennis) club. Actually, I don't want to do it, Because I have no experience in teaching teens, I prefer teaching adults.
In the class, the oldest student is about 15 years old, the yongest one is about 8 years old. All of the students joint this club to study how to play ping pang well. Some of them are from other cities, so they have to live here and study here.

Only after teaching 2 lessons, I figured out most were only 4th or 5th grade level of elementary school, even the oldest one. Obviously, they pay more attentions to study ping pang, and don't put their study first. The class was so noisy, few one wants to study english. I donot want to manage the class at all, I am not a professional english teacher, I am a clerk instead. I was just selected to teach them, not to take care children.

Maybe some of them could be ping pang world champions in the future, only just "maybe". If they can't be successful in this field, what can they do? Even as a ping pang coach, it also needs knowledge.