There are several advantages to single-sex school. Firstly, schools can concentrate on teaching subjects that interest students most .For example,girls are often more interested in languages and an all-girl school can find more time for such subjects in the timetable. Secondly,many people think that girls and boys learn better in classes of the same sex. They say that there is more competition between students and that generally results are better. Finally, supporters of single-sex schools also believe that students are calmer and behave better, too.