Normality and legality are the first elements.
Choosing a formal and legal institution to promote the subjects that children need to strengthen should be the basic principle that parents should follow. For example, the weak links of children, or links that are not well understood and absorbed at a certain stage, need to be strengthened. Regularity and legality are both the guarantee of the course content and the guarantee of the smooth progress of the course. If the organization you choose is always closed for rectification, how can you ensure the learning effect?
Avoid paying large sums of money at one time.
We suggest avoiding a large number of one-time payments while choosing a formal institution. Maybe the more classes you take at a time, the more benefits you will enjoy. In fact, from another angle, you have also taken more risks.