AddVance will have differing effects on children, it is therefore impossible to state whether or not it will work for your little one and/or to what degree it will help.
Determining whether his reluctance to do additional work is a true difficulty concentrating or due to laziness, will be a crucial step. Sometimes children avoid tasks simply they are difficult for the child. Having his eyes and ears tested will rule out any difficulty there.
If you are working with your 3yr old as well, some healthy competition may work wonders: if the older one sees his little brother is getting special attention and maybe a sticker for doing good work, he is likely to want some of this too and try to get involved without you trying.
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