WAâs teachersâ union is chasing a 15 per cent increase to wages and allowances over two years, arguing the public education system its members work in is âno longer fit for purpose.â The State School Teachers Unionâs proposed log of claims has revealed it will seek an 8.5 per cent bump in the first year of a new agreement, followed by 6.5 per cent in the second year, or national CPI, whichever is greater.