Experience shows us that one of the keys is to make small groups of students, in order to give the attention and academic follow up of each one, dedicating the necessary time. The students feel more self confident.
With big groups the teacher does not have time to attend all the class, slows down the rhythm of the class.
You must create a group in which students feel comfortable, in order to show their potential and take advantage of each class.
In this way, our groups will never exceed 10 students.