My opinion is that boys and girls should go to the same schools or classes. This is because boys and girls can learn from each other. I myself went to a mixed school from elementary to a high school. I feel more comfortable than the students who did not go to mixed schools. For example, in my home town we had both mixed and separate school. The separate schools were up to eighth school, but the mixed schools were up to a high school. The students who went to separate schools had to go to mixed schools when they had finished the eighth grade.
I had the chance to meet those students in my school when I was in high school. I thought they were different than the students who went to the mixed schools. They used to be shy to sit at the same desk with the opposite sex during classes. They used to prefer to sit with the same sex. However, they seemed to be more focused on their studies. I think they had poor social skills than the students who went to mixed schools.
Finally, I am in favor of mixed schools this is because my experience with mixed schools was excellent. I was happy with my classmates and we used to play together. I did not see the difference between boys and girls. We used to be like brothers and sisters and we treated each other with respect. Besides we used to support each other with our homeworks and had great fun.