Conversation so far:
what grade is a 12 year old in uk
A 12 year old in the UK is in level 7 or 8 at key stage 3, which is equivalent to 6th and 7th grades in the US.
how many key stages are there in the uk educational system
In each UK country, there are five stages of education

Question: what are the stages
Self-contained rewrite: what are the five stages of education in the uk