A few problems with that:School discipline is easy.
Tie it to benefits.
If you're not employable, no benefits.
Employability could be based on a high school certificate of achievement. Indicating no less than five E grades (or numbers) in English, Maths and three other subjects, an attendance rate of 85% on time, and a discipline record of an acceptable standard.
No certificate? Sounds like you need to go to college and prove that you can turn up and be good and get the required GCSE passes.
Severe miscreants, especially those that hit teachers, should be sent to special schools. Not special departments within schools, get em gone. Away from the family in a residential setting where fast food and e numbers do not make an appearance.
Whilst they're away, the family don't require child benefit or other payments for that child. If they can afford it, contributions to their spawn's upkeep will be gratefully received.
1. Some tearaways sort themselves out as they get a bit older.
2. Has the link between food additives been proven?
3. The worst offender at my school was in a residential institution - full of miscreants. Sent to a normal school though.
However, the ability to distinguish between the non academic but well behaved and the disruptive ones would be good.