I was going through that teenage rebellious period.
I wouldn't apply myself to my school work, and although leaving school at 14 years of age was almost the norm back then, my parents did manage to get it through my thick skull that there was no real future doing the things I was qualified for in my home town.
I had a cousin in the Navy who used to visit and tell us of the things he used to do, so I suggested that I be allowed to join the Navy, and was fortunate that at that time we had a Junior Recruit Scheme, whereby you could join up at 15 years of age. I applied to join and after the usual tests was accepted.
Little did I know that I had just signed up for, 12 months of what would probably be, the most closely scrutinised and disciplined High School in Australia. Although most of us were only of year 10 standard most of us passed at least several subjects to Year 12 standard after the year. There were no "airy fairy" subjects, it was all English, Maths I & II, Physics, Chemistry plus Naval subjects, History, Seamanship, Navigation and PT,... lots and lots and lots, of PT and of course,... Rifle drill. (sometimes these were combined) A process called "shake ups", designed to focus ones thoughts and bring about enlightenment.

Today it would be called "physical abuse or assault".
The Junior Recruit Scheme was shut down in the 1980s as it contravened the "Child Soldier" laws. Never the less, it certainly fulfilled a real need, straightening out the more rebellious spirits among us.