First of all, girls and boys will learn valuable information about opposite gender. According to scientific research, most boys are more logical than girls. This is very helpful for girls and boys to influence each other. For example, when girls solve problems, they are always impacted by their emotions. Therefore, boys can teach them how to solve problems without overly emotional overeating.However, many parents may think that it is not necessary girls and boys to study together. Because girls and boys at this age still are not mature. They may not be in a position to teach each other. They should focus on their studying. If they are allowed to learn in the same class, they can come together and share their ideas because they have different thinking strategies. Their academic results are generally better than single-sex school. I used to study in the co-educational high school. There were many students who not only really enjoy school activities but also got great grade.