Children start 'community schooling' at an early age. There is little formal education at this stage: the important thing is to learn social skills i.e. train them to be decent human beings.
They go to junior school at approx age 7, where they start traditional education. They cannot leave junior school until they have mastered basic literacy and numeracy.
The school leaving age is approx 14. At this stage they either
a) go on to high school BUT this is a privilege not a right
b) go to work
c) stay in junior until they have gained basic literacy & numeracy
They cannot leave junior school and do nothing. If they cannot find a job themselves then a job will be imposed upon them (probably a job that does not require academic prowess but is socially useful like litter-picking or hospital-visiting). No-one is allowed to be a NEET until they are 18.
Everyone is given an 'allocation' of a number of years' teaching. This enables people who opted out at age 14 to come back into the education system at a later age, if they so wish.
After age 14, students are only in the system because they want to be there and teachers are willing for them to be there. There will be no more low-level disruption and everyone can get on with the job!