First of all, no matter what agreements, guarantees, etc. Whether it is signed has legal effect. First, it depends on whether the content violates legal provisions and social morality; The second is to see if it is the true expression of the meaning of both parties; Third, it depends on whether the parties have full capacity for civil conduct. Let's see if the school should sign an exemption clause, which meets the above elements. Because schools should have the responsibility and obligation to supervise students during their school days, it is invalid to exempt themselves from their legal obligations. It is mandatory by law that the school should bear the corresponding legal responsibility for the accidents that occur during the school period. Schools should not use so-called "students' grades" to reduce or exempt them from their responsibilities.