Does your child have basic knowledge of English? The most important thing for you is to go to the local training institution near your school or residence to listen to their lectures and see how additional training schools teach children and attend public classes.
Children are still relatively young, and general educational institutions can teach good children's classes. The key is the way children guide, teaching methods, pronunciation and the qualifications of lecturers.
Where is your area? Face to face communication between people is the most effective. You should communicate with teachers more.
What you said is that the quality in your place is better, and we don't know. Or you can list the educational institutions and levels around you, and we will make a screening for you, and the effect will be much better.
As an English training teacher, we all want to learn as much as possible from the activities held for children and learn from them. According to children's acceptance and situation, students are the main body to promote all-round intellectual development, because we also want you to study for a long time, not for a day or a month, so all aspects will definitely make your children grow up, and of course they will be more responsible than studying at school.
Finally, I wish you find a suitable institution. You can take your children to listen to their open classes and chat with their teachers.