Education preferential compulsory purchase code gives priority to purchase. Please bind the account and use it within the validity period, otherwise it will be invalid. During the validity period, a compulsory purchase code can only be bound to one account, used once, and will be invalid after placing an order. If the order is cancelled, the qualification will be invalid. The number of mandatory codes bound to each mandatory code product is limited. After reaching the upper limit, new users can no longer bind the mandatory code product.