The outbreak of COVID-19 in 2020 was all of sudden, in order to prevent the spread of the pandemic, most cities and countries in China were locked down, also, solutions such as the lockdown of city and village, traffic control were taken, and the collective attentive study was stopped. Under the circumstances, schools came up with many methods to achieve “School’s out, but Class’s on”: Five schools in a city forged alliances to draw on each other's strengths; top Math teachers in different schools exploited or adapted teaching resources to design homework and test; more than sixty teachers answered students' questions online in real-time; teachers chose proper resources for different students to improve their grades; students had online tests and got feedback in time to find their disadvantages. At last, this paper briefly introduces those methods' achievements
COVID-19, Math in Secondary Vocational School, “School’s out, but Class’s on”, Strategies
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