Do boys and girls learn better together?
15 October 2014 Last updated at 07:38 BST
Do you go to school with just boys, just girls, or a mixed school where both boys and girls share a classroom?
There's a big debate going on about whether single-sex or mixed schools are better for learning.
In the UK a majority of schools (96%) are mixed schools.
Only 4% of schools are only for boys, or only for girls.
Jenny visited some schools in Manchester to find out what children there think.