Briefly describe the development trend of modern school education system?
① Strengthen preschool education and attach importance to the connection with primary education; ② Strengthen the popularization of compulsory education and extend the period of compulsory education; ③ General education and vocational education are developing in the direction of mutual penetration; ④ The types of higher education are increasingly diversified; ⑤ The boundary between academic education and non-academic education is gradually weakening; ⑤ The education system is conducive to international exchange.