Это вы не видели еще требования английских школ.

Поговорите со школой о том, насколько допустимы границы. А так вот например....
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As throughout the School and described in the General Prospectus, a high standard of behaviour is instilled: mutual respect, good conduct and cooperation are expected from all.
Secondary School Rule Transgressions
1. Incorrect uniform, jewellery, hair, coloured fingernails, make up.
2. Late to registration or lessons.
3. Possession or use of mobile phones. Inappropriate use of laptop/iPad or other electronic devices during the school day.
4. Incorrect locker usage or persistent lack of organisation which includes forgetting books, equipment and locker key.
5. Inappropriate behaviour which includes bullying of any sort, insubordination, defiance, using obscene or immoral language, bringing banned items to school and failing to follow the detailed school rules or other instructions of the staff.
6. Vandalising school property, equipment or books or other students’ possessions.
7. Dishonesty including lying, cheating, stealing.
8. Leaving school without permission and truancy. Not attending compulsory school events. Being in an out-of-bounds area.
9. Violent or aggressive behaviour.
10. Smoking (including electronic cigarettes) or the possession of alcohol or illegal substances.

Там внизу про прически. Например.

Есть правила поведения - вот они. Дети - они не тупые ) Какой тут соус может быть?

Я-бы сказал "иншалла" :)