Co-educational school is better than single-sex school because naturally opposite sex were always meant to be together in the same co-habitation. Perharps we would have had a planet for male only and another for females only so why do we choose otherwise. I will pick on the Disadvanges of Single-sex in the case of sexual inter-relations between same sex, howerver this act is due to the ability to conform the natural human instinct but people in single-sex school has being psycological deprived of opposite sex and has made same sexing normal to them. I feel Single-sex school was what lead to the approval of same sex thing because it became normal. On that note i would say co-educational school is better than sinle-sex school.

Completely agree with Resh, I have observed some cases personally where boys /girls who came from single sex school , face many problems like confidence, communication when they join co education classes for higher education. Co ed also teaches us how to behave and understand opposite sex.