Eng: I use 2 sets myself and use them with my baby every day.
Personally, I think that we can't really learn English well by traditional English training classes or textbooks, back words and grammar. First of all, the teaching materials are too little and the scenes are too simple to cope with the fluidity, complexity and variability of the language. Secondly, language is a skill, not knowledge, just like playing basketball. If you want to learn, you must contact the court. You will never learn the following texts, skills and rules.
Learning English through ieng's massive follow-up reading and massive input, I insist on reading for more than 30 minutes every day, and I am very tired every day. In the future, my children will get good grades, and maybe I can get a TOEFL IELTS or something, haha!