go round local airfields, knock on doors, ask to see the "boss" in maintenance hangars, plead for a start as tea-boy, floor-sweeper or whatever.....the hard part is making the first contacts and friends...this applies everywhere...if your profile doesn't fit as well as someone else's, you're out!
Impress with your willingness,interest and diligence. no use doing a rough job of cleaning the bog, just 'cos you don't like it.
lastly, I'm afraid you will still need to study,pass exams and get the bits of paper that "prove" you are competent. it covers the employer's backside and keeps jobsworth examiners in a job.
You'll find Further Education a totally different environment from school.
good luck.