Look... take a four (4) year old and put him in a grade 10 goemetry class - now keep him there until he either gets it and passes, or gives up and fails. now take that four year old that passed grade 10 geometry and put him in a kindergarden class... He's just gonna go: "WTF! Toy building blocks! What the hell do I do with these?"
Take a four (4) year old and put him in kindergarden, let him play with block and become acclimatized to the learning environment. By the time he's ready for grade 10, he's got a much better chance of getting a pass!