if your study in China is less than 6 months, the business visa is Ok, you don't need to apply for a student visa. If your study lasts more than 6 months, you need to apply for a student visa, it is up to your school which organize JW201 or JW202 and admission letter to you, but I'm afraid that you can't get them now because Chinese government has stopped to issue JW201 or JW202 owing to Asian Games. The visa policy will be return to normal process after the end of Asian Games. You'd better apply for it in january 2011.