Schools educating young people permanently excluded from mainstream education say they are under pressure due to a rise in exclusions.
Permanent exclusions in Surrey rose 81% from 59 in 2018-19 to 107 in 2021-22.
The head of three Pupil Referral Units (PRUs), which educates excluded and suspended pupils, said demand for its service had grown since the pandemic.
The government said it backed head teachers using suspension and permanent exclusion where warranted.
Amy Smith, director of education at the Inclusive Education Trust, said the need for its services was "the highest that I've ever seen".
"There is not enough to support young people, particularly those exhibiting challenging behaviour," she said.
Jodie said her 10-year-old son was being taught at Wey Valley College in Guildford after he was expelled from a primary school.
"I think it was a mixture of hormones, ADHD and age, and then it got to the point where he was expelled.
"It was heartbreaking. We both cried when they said that was it, he wasn't going back."
