Based on the link that kim provided I conclude that DD, DH and me (and thus most probably DS too) are visual spatial thinkers.

I would be interested very much in hearing what the experts have to say on suporting visual spatial learners at the school.

Intuitively speaking, for Montessori I would group several related activities into a more complex one.
And I would let the child do task B even if s/he cannot do task A.