I had two children in P7 and P5 so can only comment on Primary.
My P7 child is Dyslexic. He repeated P1 (instead of being offered any help, he has other ASD issues too). I tried two local Primary schools. One was in a very depressed area, run by an expupil who bullied the children of the parents she had not liked when she was there. She was entirely unaccountable and barely in the school. She would 'pop in' three times a week for an hour or so in jeans, clutching a coffee, the rest of the time she 'worked from home'. At that school I was told my ds had no issues except he had 'a right English accent, like his parents'. (he has multiple dx of SEN). I took this to the top of the Council and they called SS on us for 'concerns re parental imagining of dx' and tried to us the Named Person legislation to call child protection concerns on us. We have multiple written reports by NHS professionals (some in England some in Scotland). We got a lawyer involved and they shut up. But I will never forget it. There was a whole culture of poor standards, coverup and intimidation of those who dared question it. I think this is happening in the SNP Govt right now (I also think it happens equally in Westmonster, but education has been devolved for over a decade now so the SNP must take some responsibility and the latest figures are deeply depressing).
The other local Primary we tried was run by a Head who was there 8am-6pm. But the School was run like a boot camp. It was in a very affluent area and despite the children often having private Maths/English/music/French lessons, standards were simply dire. When the School was inspected and found to be dire the local Council refused to answer questions at a meeting and told parents that they were responsible for 'talking the School down'. No accountability at all.
The local High School is considered the best in the County. Like many large High Schools, it helps if you are academic, or sporty, or good at drama/music. If you struggle, you are largely unsupported. But, I know of four families whose children have struggled (2 due to appalling bullying, 2 due to SEN). ALL of those kids are now in thier 3rd PLUS year of '4 hours a week tuition' delivered at the local primary school. No real attempt to get them back into mainstream education or provide for their educational needs. Staggering. It has cut its number of subjects offered at Higher, and cut them again. It has a name for not putting students forward for exams unless it is very sure they will pass them well.
I moved my kids to England 6m ago. The School is on it's 3rd Head since then. The Senco is dire. It is NOT what we had hoped for. But, by golly, is it better! There is a sense of standards, of pride in the School. The kids are constantly told to 'try harder', 'give 110%', 'you represent the School'. Regular challenging homework is given. There are educational trips. My 9 year old has 8 teachers across 8 subjects and simply LOVES it. I can see what is wrong with this system - endless pressure on kids, the horror that is SATS aged 10, etc, so I might not necessarily stay but it is certainly different.
The 'correct' path would be somewhere in between the rigidity and overtesting of the English system and the sloppy woolly muddle that is CforE. But the thought of returning to the Scottish system fills me with gloom.