It is reasonable to allocate one hour and twenty classes at a time. He talks about things in every class. Every time after class, he stayed to practice without repeating what he had mastered. In the final analysis, the key is that the tutor must have a general understanding in his heart, know which topics to talk about, what exercises to do and have experience. Because a little knowledge is more difficult to teach than nothing, because we have to correct some mistakes that have been made.

Of course, these twenty hours should be all he said. If you have more time to do exercises by yourself, it's hard to say whether it will be enough.

In addition, it is a good choice to go to a training institution for small classes. The key is to choose a teacher who can learn and grasp the essentials. However, going to such a small class may be more expensive.