These are companies that I have personal knowledge of and therefore trust to recommend. Many of them work online so can be accessed wherever your school is situated.
Train Your Mind
Mindfulness, hypnotherapy and coaching
LMK Complimentary Therapies
The Mind Fixer - Steve Blampied
Back Care & Ergonomics for Children, Education & Therapy Professionals
They do no pay me to advertise here, they are companies that I know would bring value to your wellbeing programme, please just mention that you found them through this site.