this is why the brits are

middle school
11-12 year olds: year 7
12-13 year olds: year 8
13-14 year olds: year 9

high school
14-15 year olds: year 10
15-16 year olds: year 11
16-17 year olds: year 12
17-18 year olds: year 13

Ah

I’m in year 9

i'll be in year 11 (10th grade equivalent) this year.