Private schools select their students by the score of the entrance exam or other test results. So, most students have high studying abilities and they are children from high class families. At a result, each student can meet friends with good backgrounds and cause a synergy effect within the competitions with superior colleagues. That is, they recieve privileged environments and favorable support for entering good universities. However, private schools require high levels of tuition. It means that students from middle or lower classes families cannot enter and the tuition can be a large burden for the parents. Students cannot experience making friends with students from various classes. Some students can feel a sense of inferiority by comparing themselves to their other friends' backgrounds. So, the choice between private school and public school should be considered carefully.