Some more alert parents will have already noticed their kids 'problems before they start school. Other kids' problems should be recognized by teachers or by schools 'special education systems. At least that's the theory.
部分警覺性較高的父母，在孩子入學前就已經發現問題，其他孩子則應該在入學後，經由班級老師或學校特教系統發覺。