ES, I just have one thing to say: WOW!
Now I know who can help me with my music theory doubts.
Don't worry, just kidding!
The educational system seems to be the same as here, including the cuttings. Today, what we used to learn at school in past years, s not available anymore but the best resources to learn and investigate are at a distance of a click. Inspite of that, kids don't seem to bother with it.
My own kids sometimes ask me questions... when I don't know the answer I always tell them: "Google it!".
The music classes here, in the first high school years, are considered as of "low importance" for the curriculum and their teachers are not considered the same way as a math or any language teacher.
That's a shame!
With your experience I think you should consider seriously return to music as soon as you can. You had a serious "parallel" carreer. With a curriculum like that, you can resume anytime you want.
When I was younger I also was playing drums in rock/pop bands and for a few years I was earning more than I am today with my work. But a friend of mine, who is a famous professional drummer, always tell me the worst mistake he did was dropping school to play the drums.