My kids (CA high school) were incredibly stressed with a heavy workload that seemed mostly pointless and specifically, teachers who didn't care and students who didn't care as a result and used AI and cheated whenever possible. Both opted out of high school after 2 years (GED-equivalent test, to junior college for 2 years). They were and are getting basically straight A/A+s. Older one just finished 2 years of JC with 2 associates degrees and 4 certificates, and transferred to state school for 2 years to finish BA.
My experience was wildly different. I was what was generally considered a middle-of-the-road high school in a good-to-great school district in Canada (the highest-performing one next to the university was a whole different level). I rarely had much homework other than writing a few essays - which I often printed on my dot-matrix printer (yes, this was in the 80s). I studied half an hour for my highest-level senior chem final and aced it. Maybe studied 1-2 hours for calc, etc. Computer labs were some of the best times - hacking Basic on PETs.
Got to university (computer engineering, just slightly below electrical engineering) and it was brutal. Dropped 25% from high school to 1A semester. Had no study habits, "just wing it" had worked just fine to this point - if anything, it had worked too well. Of course, basically everyone in my class of 80 had the same story: graduated #1 overall in their high school (just like me). Some had way better habits / discipline. We had one student who came back to school 10 years after trying to make it as a studio musician. I once asked him point blank: so, do you do 5 hours of homework a night (because he ALWAYS knew the answer, etc) - he looked at me straightfaced and said "I try to do 6". Eventually, I managed to graduate in the top 1/3 of my class, stay on to get an MASc and have had a ~30 year career in software, so I'm reasonably happy. But I've had a hard time identifying with my kids' experience - high school was a blast for me and super easy. University was not. It's the other way around for them.