EPGY OE Math lectures are very matter-of-fact/to the point/no fluff - which could work great or not depending on the child. (Liking math a lot + some experience of learning math on his own could be a good predictor whether it would work for your child *MOSTLY ON HIS OWN*.)

(I'm elaborating on the MON's valid observation above. I do think EPGY OE Math is of very high quality.)