What to doo with teen job?

Ok well i've been looking for a job since school was out with no luck but i have 3 more interview and with one place the manger likes me but my mom on the other hand wants me to give uo shes like nobody wants to hire you and she said that even if i do get a job i would have to quit for school but i dont see why because then i'll just be sitting home doing nothing but anyway theres no way in hell i'll quit because also i want to join this kung fu cl and my mom asked me how was i going to pay for it with no money which i told her thats why im getting a job but anyway what do you think about this and what to tell my mom cause shes really pissing me off