Two teachers have told the BBC their schools are facing a huge crisis because of a lack of staff.
The pair, who spoke anonymously, teach at different schools in the south west and have been outlining their experiences.
It comes as teacher vacancies have risen by two thirds in the region, with 8,200 vacancies between 2021 and 2023.
The Department for Education said it had increased the number of teachers working in state-funded schools.
One of the teachers, "Ben", not his real name, thinks the situation is getting worse.
"There is definitely a crisis with certain subjects. They don't have enough maths teachers to teach maths, so Year 10 and 11 have maths teachers in front of them but Years 7,8 and 9 haven't got specialist maths teachers.
"They're having to get them to come in from other schools and help out.
"A lot of teachers are having to teach outside of their specialism, so they'll teach their main subject but then they'll also be expected to pick up other subjects.
"For the kids, that's not the best."
He added a lack of staff was also affecting school trips.
"We're finding it difficult in the school. We can't run school trips because of a lack of cover."
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