Just out of interest - why did you only attend4 out of 10 interviews? I guess at the end of the day it's more schools picking us then we picking which schools to attend. Just try out more schools if possible... Sad reality
Take it easy.
And I think it is a kid's nature to want to explore more instead of sitting down for a long time. It has nothing to do with 'concentration' in my opinion. It is just against the kid's nature to sit down for so long.
There is always more than one way of playing a toy. So don't be upset or discouraged if he doesn't play the toy the way you want him to. Perhaps he is exploring different ways to play something (and will learn from it in the process).
I see! Add oil! You still have Christmas holidays to spend more time with baby. Encourage him and praise baby more. They can feel your emotions. I applied for leaves around his interviews too just to get more FaceTime with him ;)