Teenagers always try to have a free and independent life. To do this they often choose the job which is unsuitable to their age.
On the one hand, these kind of aspirations help them to build a life and better manage their own life.
On the other hand, teenagers who do part time jobs forgot about their studies and think that this work helps them to have a comfortable lifestyle in the future. But the student finally leaves without an education.
In my opinion I think it is good for teenagers have their own pocket money and are aware understanding how money is made, but it is bad if they were missing their studies.