Yes The only disadvantage of online practice course is that it can't communicate with teachers face to face, so it is particularly important to answer questions online. The after-sales service of various institutions is uneven, and some institutions are only nominal. It needs to be selected according to the cost performance, whether the institution is formal, the quality of the course and the after-sales situation. Regular institutions can be found directly on the Internet. If they register, they can report directly to official website or the official WeChat account. Don't trust private money transfer agencies.