They said that they could learn how to do group work with opposite sex, and they could cooperate with them, too. Pro: Single Sex Education Increases Opportunities for Leadership Single sex education increases opportunities for leadership, especially for females.
A similar experiment in Mill Hill, also in England, achieved similar results. Political, civil rights, socioeconomic and legal concerns also come into play. Females perform better when they are not competing with males.
The single-sex format creates opportunities that don't exist in the coed classroom. Actually, it does not mean that all girls are better at those things and all boys are better at those things. But they also say theres a lack of evidence that these differences matter to learning at the individual level.