Required certs for schooling

I’m currently 15 and had to drop out of school last year to help mummy dearest pay the bills, I’m currently working 5 days a week at a bakery (3-9:30) 2 days a week helping mum with the landscaping business and 4-5 days working at a mechanics shop (8-2) and hopefully will be perusing a mechanics apprenticeship next year, due to my situation I can’t really go back to school full time to get my WACE (Australian diploma). I really hope to be able to study at a language school in Japan in a few years but am worried about being rejected due to not having any academic merits, how much merit does a trade/apprenticeship hold in that situation and what certifications (other then the standard n5 test) would be good for me to aim for for my best chances

by Far_Dentist_6212