Hi alanchoi,
Don't worry! I think Alan will easy to adapt his school life & should be enjoy it very soon. As I saw from his pic, he is very smart boy. Also your handsome boy will be attracted alot of fans, just headache for choose which one he would like to play with him/her first, heehee.
Besides, I think he has quite good social skill as he has a elder sister accompany him. Liam is no brother/sister right now, so I will also afraid he scare when he goes to school later. Therefore, I always take him goes to park to let him close to other kids.
Jelly