If you’re looking for an evidence-based approach for use with individual children who are struggling to acquire or maintain specific skills, precision teaching could be useful.
Monitoring the acquisition of basic educational skills, such as number facts in numeracy, it can be used in all curriculum areas. Through regular monitoring, practising accuracy and fluency, precision teaching enables practitioners to respond quickly and adjust their teaching and interventions to ensure optimum progress for the child.
For example, research by Anne C Downer (2007) found that infant children increased their sight vocabulary by an average of two words a week using this approach.
You can find useful resources here.