The first method interviews. By conducting interviews with different students in different schools you can collect data. You can ask for their honest opinions. You can compare the answers of one group of students with another group from another school. The second method is observation. You can use this method for research. For this you may have to spend time in different kinds of schools, schools for boys, schools for girls and co-education schools: You should then observe how students behave in these different places. By making close observations, you may be able to get the answer to your research problem.
The third method is survey, For this a questionnaire is prepared. The questionnaire should be made in such a way that students should be able to give their franks opinions about their schools. After that, an equal number of the questionnaire should be distributed to each kind of school. After getting them filled, collect them and analyze the answers.