Need Idea to help 3 year old

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It may also be completely unrelated and simply coincidental. It may not be behavioural or to do with fine motor skill ability. It's a completely different part of the brain that translates what a person hears or sees and then replicates. It has to go through the working memory and in certain mediums it can be great and others terrible. His inability to write his name or print letters could be a working memory issue or simply a delay which will catch up later on. I'd carry on with the activities you are doing to reinforce the learning. If he is able to verbalize the letters shapes and numbers but not able to write/draw them, I'd hazard a guess that youre barking up the wrong tree and that this is actually a processing issue not a physical or behavioural issue. His acting out could very much be connected to this very issue too.