"I grew up in Europe" can literally be any one of over 40 different countries, and even more education systems.
I am in Germany, and school starts at 8 in Berlin, 8:05 in Wiesbaden, 7:45 in some small cities in Baden-Württemberg... And those are only the ones that I, personally, experienced. I'm sure Poland and Spain have different times, not lastly owing to timezones etc.
Please don't treat all of Europe as one single country with one set of customs.