We dont!
We have sports day where 'Houses' slash Teams go against each uvva!
Theres like 8 Tutor Groups in each Year so lets say Im in 9H - then anuvva class joins for example 9C joins the House. Thats a Year complete now you only need 2from Year 10 and 2 from Year 11. then yes its all done. That makes a full house. Same applies to other Houses. Then we make up our own names! I always join the Slurpy Steroids House cuz theyve got the most sporty people! Woop! I always do footy, athletics [200m], rugby & orienteering.
Course i always win!

I'm the defending 200m sprinter champion! I ran it 24.3s last year. I feel much fitta now!