ds1's school - 'informal' top and bottom sets for maths and English in y7 (but academically selective school so narrower ability range to start off with), 'proper' sets for maths, English, sciences, MFL, history, geography and PE for Y8 & Y9ds2's school - streamed for everything except for PE and Tech - streaming based primarily on maths ability which suits geeky ds2 down to the ground.