When planning a class we teachers should consider the class-group we have to teach, taking into account both low-achievers and high-achievers, and the average students.
When teaching English or French or any other language we should think that a few students can reach less than the average students, and high-achievers can reach further, and for whom we have to avoid they would get bored.
Sometimes we will sit a good student next to a low-achiever.
Or we will have to sit a peaceful student next to a hyperactive student, also with attention deficit typically.
And at tutoring sessions, with individuals, we can help each student as he is, as the way he is. / Photo from: teacher_students www bridgeboffin com