Every year there are new house captains. They count up all the house points from all the classes in the last week and see what house got the most. These teams are called Topaz, Emerald, Ruby and Sapphire.
If they wanted to be a house captain, they had to make a speech to convince their year that they should be a house captain.
Then, after they had all made their speeches, their year group voted and whoever got the highest votes they became the new house captains and then whoever got the second highest votes they were the vice captains.