Students and parents must sign a contract agreeing to the terms of enrollment.
The contract agreed is rumoured to be worth around £1.5 million.
But in 1996, pushed by the union, the school board bought out the company's contract, agreeing to pay it $3.3 million.
A new member has to sign a contract agreeing to abide by those rules.
Students sign an academic contract agreeing to rules about completing work.
To the progress, the most expensive contract ever agreed.
Canada was the first country to sign a contract agreeing to open an exhibition at Expo 2010.
The contract with the union, signed in 1990, agreed to pay up to $3.35 billion in benefits, divided among the two funds.
Parents and students are asked to sign written contracts agreeing to the school's rules and requirements.
In April 2009 he was signed by Palmeiras, agreed a 4-year contract.