It definitely helps, but I think sending your child for classes and brain training is actually much more effective, frankly
I think it’s ok to try it out. I’m interested in this as well. Afterall no harm, only benefits if it turns out well.
I wouldn't rubbish them because I feel they do work to an extent, especially if your child is a visual learner.
U can look at glen doman book. Expert in this area. There are some schools that teaches the glen doman method
No harm trying
Depends