I did it before but my main purpose was not to do verification again.
You had better to ask for the details of your kid situation and then focus and train his / her weekness. BTW, my point was not just to focus on speaking if he / she has not yet spoken. For example, he / she cannot sit on the seat to 'get training' by ST. How does he / she get improvement? So, you need to let him / her clam down first (perhap, ST can do it well). So, another training may be needed in parallel in order to get the best result.
Per my son case, if his / her IQ is not bad. He / she should have a big room to get improvement by getting training.