I think he should only study English very hard. First, he should study and memorize English words. And I think if you talk your mother your dream, your mother understand. Do your best for your dream. Good luck!
My part time job is the daily dishes shop of Takarazuka Hankyu. I work three or fore times a week. I work for roughly five hours after school. I need money because I am living alone. This job was very tight but I enjoy it now.