Is it better if girls study together with boys at BIL?

I think that boys and girls should study together at BIL. Separate studying for boys and girls allows you to better focus on education process. Therefore, the results will be much better than in schools with mixed classes. However, these teenagers most often become antisocial. And in the future, these boys and girls will be part of a society where people studied in mixed classes and because of separate education, it will be very difficult for them in adulthood.