Elementary school ('92-'97): was awful. Nowadays, it's easy to tell that every new generation is worse and worse, but mine wasn't good at all either. Bullying was already huge, people in my class was petty even for the silliest reasons. Most teachers created an atmosphere of terror, i distinctly recall one of them going around the school openly shaming me for a bad answer in a test (i was 8 or 9 at best). And my parents always blindly sided with teachers without ever letting me try a defense, and wanted me to get the highest scores and have the best behaviour even if they weren't good at school themselves, at all, when they were kids. During 5th year a third afternoon at school was added (two were already too much...) so time at elementary seemed to never end, of course some of the worst teachers stayed for all five years and they always threat to flunk the worst bullies and force them to repeat 5th grade, but of course, after the final exams, they didn't. I would not be surprised if some of those terrible kids is in jail right now or perpetually unemployed.
Junior high ('97-'00): first two years had better professors overall and i had a little better grades, but there was still a severe problem with bullies. I didn't have to go to school on afternoons anymore (it was my choice as a retort against elementary teachers that wanted me to pass more hours at school), but i still was a laughing stock and was never able to react, to a point that even my whole family seemed to dislike me hard. Halfway through, i asked to the principal to change section for the third year, and if i remember, my request would have been accepted if my then current teachers wouldn't have voted against by majority. Only two of them declared they wanted to force me to stay because "you must solve problems, not avoid them". Oh, yes, whatever. Those little pricks couldn't look forward to pick on me even harder than ever for another 9 months, knowing i wanted to escape. Well, they didn't. I went from A to the B section and i had the absolute best time in my school career... still retained some of the best teachers from first two years and except for one (a try-too-hard liberal) even the others were good, i returned once again to school on two afternoons but this time it was an enjoyable experience. On fridays after lunch, we had extra classes to learn extra activities as drawing comics, chess, sports, computer programming, music keyboard lessons... it was a blast. To a point where i put myself in trouble because i was having too much fun with my new classmates. I still have the photo class framed in my room and that year i went to my one and only school trip for more than one day (it was great, of course).
High school ('00-'05): while still in junior high, i chose a classical lyceum without a serious plan for the future, probably just to avoid mathematics, which i always disliked, as much as possible. My first test in that hated subject was a 4.5 out of 10 and immediately my mom sarcastically suggested me to drop out and go to work... well, that 4.5 is the highest score i ever took in five years of math tests. After a hard start, i began getting decent scores for the actually important subjects as ancient greek and latin, the first full year ended pretty good but the second was a long time of highs and lows.
Halfway through third year, i didn't care any more about maths and started returning its tests as blank pages, both as a retort against my parents who decided to waste money for a private teacher i never asked for, and also because i needed to have a little more fun and stop being depressed. All in all, third year was the worst out of five, i wanted to drop out at the beginning and search for a full time job, but my parents forced me to continue: they wanted me to "stay behind a desk", meaning "graduated at university". Somehow, studying seriously only for the last month and a half, i managed to not repeat third grade as i would have deserved. 4th year was the absolute best, second only to the 3rd in junior high: i didn't even have to study too much and aside from maths my grades were all pretty good, i started playing basketball again, had fun in general with videogames and music... the 5th was another hard one, even if not as much as two years before. Still, i managed to get out with a mediocre 67/100 out of extreme kindness of all my professors and cheered because i already decided that my entire school experience was finally over once and for all. Nonetheless, i still have a good memory of these last five years because of what i learned from real life and not straight from the books, even if i hardly socialized with classmates and other students from the entire institute. Bullying was non existent this time, but i wasn't a good person to have around, whether if depressed or passive-aggressive for really stupid reasons. I lost contact with nearly all of these people, and well, it's understandable if they forgot me 100%
University: didn't go, not even a single day. I finished high school only two months earlier and it was hard telling the news to my parents. I even tried, after turning 18 and finishing 4th year, to tell them i needed a sabbatical year after high school to work and save money before resuming studies, but once again i was denied in a non delicate way. The day i should have gone to enroll somewhere, i actually went out of my house, but watching those hallways full of people and books, and the papers i had to write, sign and return, convinced me that i had little to no money and even less will to do something i never wanted in the first place. After a first full year unemployed and returning heavily depressed again, except for a few days here and there working in pubs, i found a job in a bakery almost next door and gladly started my career in the world of food and restaurants. "Fun" fact, even after months i was happily employed, my father STILL wanted me to go to university and not even nearby, but in a far place from italy that he likes and i don't.
Honestly, i sorta realized already since elementary/junior high that i would have become a angry, bitter adult because of the pressure i had from parents and teachers. But... to their excuse, my choices were finally accepted after some time and even if they all were sometimes way too harsh on me, i somehow managed to be a little more ready for the real world. If they were too permissive, i'd probably be a even worse man by now. I had a lot of luck for having been able to work 11 years and a half out of 14 since high school graduation, despite my immature choices as a teen.
tl: dr elementary - bad, junior high - from bad to amazing, high school - all mixed up. The sentence "school is important" is way too abused. I saw people dropping out early and have a strong career because of their choice, friends with college degrees that took almost forever to find the jobs they studied for, and even someone who finished high school without a clue on the future and still has zero experience in the real world of jobs because of laziness.