North East England. Around here, it goes like this:

• 4-8 years: First School
• 8-13 years: Middle School
• 13-16 years: High School

then

• 16-18 years: College or Sixth Form
• 18+: University, etc.

You are probably used to the two-tier system, with a primary school and a secondary school. Around here, though, we mainly have a three-tier system.