The order of the mixed ability is:
previous exposure
learning style
personality.
motivation
attitude
aptitude
1.- First the teachers have to know theirs students, because every students have differents personalities and he has to know to guide students for the best way.
2.- I think that the most important thing is to motive the students in order to practice in diferent situation in their daily live.
3.- The Teachers have to involve the students more to work in teams and to help each other.