-- I hear Tom is coming to China.--- Yes,but I'm not sure if

在条件句当中if后跟第三人称单数形式,即一般式,如
I will go to the park if it isn't raining tomorrow.
而你这句可以改写成——Yes,but I'm not sure if he will like our school or not.
所以你的说法是对的,应该用will like而不是likes.