hmm the way i see education now, as opposed to my own upbringing being asian heavily influenced by the british system, so uniform, homework, dictation, writing, etc, kids learn through experience.
like when he builds a tower, perhaps you can show him ways to build a stronger structure by interlocking the blocks but that is if that interests you also. when i read him donald duck i also add some moral values in it, there are the baddies and the police but sometimes the police was too proud of himself and mickey mouse was the real hero LOL...
or even just that hey donald duck wanted to help but made a mess in the end, he should be more careful, right?
i also try to teach him numbers and letters but there is much less pressure here as they learn from 5yo and to write from 7yo here. He knew O for oma for over a year now and our initials but that has been done at daycare also. i saw that they were hanging up initials of the kids there and so i started doing things like that at home. We went to visit his grandma, oma, that night we were reading, i pointed out the O for oma, and he hasnt missed it since so sometimes in the car, driving past a supermarket, he said Oma. Took me a while to know that he saw an "O" but it could have been a zero.
Perhaps have a chat with the daycare people and see what acitivities they do with them, in terms of crafts, cooking, etc. Perhaps you get a better idea of how to get him involved and what kind of stuff stimulates him.
Would he be more interested in "real" stuff like folding up laundry, cleaning as opposed to toys playing?! If you were doing housework, and you can teach about names of clothings starting with S, sock, shirt, skirt?
would this work for him?