Mel Massey said she is angry at the lack of investment

Mel Massey, a pupil at Cowbridge Comprehensive School, made the film called "Is it cos I is posh?" as part of a BBC Wales website project.

Examples of rundown classrooms and waterlogged playing fields are shown.

A Vale of Glamorgan Council spokesman said a redevelopment plan for three schools was being discussed.

In the film, Mel, 17, said there had been a lack of funding for improving and maintaining the school over recent years.

"They say that due to us achieving good grades, and because Cowbridge is otherwise such an affluent area, we simply aren't a priority," she said.

"It doesn't do much for morale if all you're looking at each day is horrible classrooms around you.

Broken steps to a classroom fire exit are among Mel's complaints

"The school is falling apart. It makes me feel quite angry as a pupil of the school. I feel that everyone should have good facilities in which to work with, and we simply don't."

She added: "I think this is a problem for students, teachers and parents alike.

"If a panel falls from the ceiling, everyone questions why is this happening. We're supposed to be in a safe working environment. The answer is we simply don't have enough funding."

The Vale of Glamorgan council said it was aware of the situation at Cowbridge school and plans were in place to carry out improvements.

Martin Donovan, head of strategic planning and performance with the council's education directorate, said: "The council has previously agreed a multi-million pound school investment strategy, which aims to make all schools fit for purpose in line with requirements set out by the Welsh Assembly Government.

"External consultants are currently working with the council to advise on how best to deliver this strategy which includes the rebuild/redevelopment of three secondary schools within the Vale, including Cowbridge."

Gordon Kemp, a governor at the school, is also standing as a prospective AM for the Conservative party at the assembly election in May.

He said: "The Vale is very good at putting the funding it gets from the assembly into the schools but we are a low funded authority so I certainly feel there should be more funding available."

Waterlogged pitches often stop pupils from playing

Leanne Wood, speaking for Plaid Cymru said: "Plaid Cymru who are running the Vale of Glamorgan council in coalition with Labour are hoping to find a solution to this problem."

Jane Hutt, who is standing as the Labour candidate, added: "I have been supporting the campaign to rebuild and regenerate Cowbridge Comprehensive School for the past eight years.

"The school investment plan must now be delivered and this forms part of my local election campaign."

Mark Hooper who is standing for the Liberal Democrats in the Vale said: "I think there has been an under-investment into schools environment which is something we want to fix quickest.

"We need to make sure money is invested to make sure classrooms are fit for purpose."