Interesting that France scores more highly than the UK in most of the counts. I'm British, both my kids are in the French public system (now 14 and 17yrs) so well experienced in it. French education is no walk in the park, so I'm guessing that it's cultural to a great extent and goes beyond school.
What do we have that isn't in the UK system?
Middle school / collège here. So Primary 6-10, Collège 11-15, Lycée 16-18. It does allow for a more gradual progression up to lycée, there's a visible 'growing up' between each stage - by the time they are in the last two years (the Baccalaureate years) they are expected to be and treated like adults.
No uniforms. I am a total fan of this, and DH (teacher) loves that he doesn't have to have endless, tedious battles with pupils about skirt length, shirts tucked in, blazers on or of. 99 percent of kids wear some variation of jeans, t shirt, hoody and it's just not an issue.
Long / lots of holidays so teachers and students get a proper break. Two week at October, Christmas, February, April, most of May is bank holidays, then 7-8 weeks over summer. Even longer for lycée kids as they basically stop after their exams, so could be 9 or 10 weeks off. It also means that kids spend a lot more time either at family (grandparents) or in the countryside (really normal here to have a 'country house') with family / friends.
Strict-ish sorting between vocational and academic aged 16. I think that a lot of Brits would see this as a negative. The whole 'helping every child to meet their potential' thing does not exist in schools here, they are absolutely not aiming to be comprehensives - instead they aim put children on the 'correct' path, and it's for their own good. At the end of collège, children have to choose between academic lycée and more vocational lycées. While parents can push back against the school's advice, it doesn't necessarily benefit them because a less academic child really will struggle to keep up the pace / pressure at a more academic lycée, and there is little to no support if they are struggling. Students are expected to be very self-motivated and driven to succeed if they choose the academic route. So, harsh though it seems, maybe it means that more of them end up on the 'right' path, earlier, and the less academic kids can go and do something more interesting to them at this age, rather than being bored and disrupting classes? I'm not completely convinced, but that's how French society has organised this.
French parents / teachers are strict and French children don't throw food. Well some do, of course. But my experience of France vs Uk is that parents are far more strict with behaviour, and far quicker to punish any child stepping out of line. Ditto teachers. There is no hesitation to give a bollocking to a child who's out of line. French children are left home alone from a much earlier age, and walking to school alone earlier than in the UK - so they are trained to do this safely and correctly.
Everyone goes to maternelle - and it's mandatory
Nursery starts age 2-3yrs, many kids go full-time in large classes, and they spend three years learning how to be with their peers and in a group. It's just drummed into them. Primary starts a year later at 6yrs. And students can easily re-double i.e. retake a year if they have struggled academically.
And one other thing... France is traditionally a very Socialist country, where the 'working man' has an excellent social security net and other benefits to fall back on. Taxes (including wealth taxes and inheritance taxes) are significantly higher, redistribution of wealth is a priority, families (the larger the better) are positively encouraged with subsidised childcare. Not so in the dog-eat-dog capitalist UK where it really does feel like it's every man for himself. That must add so much stress and unhappiness to households, and onto pupils in schools.