After getting back into the classical guitar lately I started looking back on my tuition during my teens.
In particular the very early tuition I did at a local music school. I wasn't the best student - I never practiced enough, but I had enough musical ability in general that I managed to cover for it and make progress regardless. But even so my teacher was always reluctant to put me forward for grades, and so I really had no way of understanding how far I'd come and also nothing to stretch myself to work towards, so my progress was slow.
The main thing I remember about that first few years was him playing Lauro's 2nd Venezuelan Waltz at the start of most sessions. Perhaps to warm up, motivate me, or just show off a bit, I was never quite sure.
We finally switched teacher, and by the time I did it turned out he was happy for me to start working towards Grade 5 as my first exam. I much preferred this teacher, it felt like much more of a collaborative process to learn and I stuck with him until leaving for university.
When I was at school studying for my Grade 8 exam, years later, the old teacher came into the music room. I spotted him out of the corner of my eye. I hadn't seen him in perhaps 4 or 5 years when he wouldn't even put me forward for Grade 3, so I switched up to playing that Lauro Waltz, which happened to be one of the exam pieces.
I'm still not certain if he recognised me or not, but I remember he stopped nearby to listen, then when I was finished said something like 'You should play it faster'. It seems that even then, nothing was good enough for this particular teacher
I wonder if anyone has any similar or differing stories...