Deduct the formal class hours first, and then deduct the complimentary class hours. For the class fees of off-campus training institutions, the given class fees are deducted from the formal class hours and then deducted from the given class hours. When the fee is refunded, the free class hours will not be refunded. This is what all institutions do when they refund fees again. After all, it is a bonus, that is, a gift, which will definitely not be counted in the refund.