1) Mixed-ability group: It represents a standard classroom that includes learners whose average scores in English range from 0 to 20.

2) High-ability group: This category represents learners of a very good level of English. This can be determined by the English school average scale 16-20.

3) Good-ability group: This category represents learners of good level of English. This can be determined by the English school average scale 13-15.99.

4) Average-ability group: This category includes learners of average level of English. This can be determined by the English average scale 10-13.99.

5) Low-ability group: This category includes learners of low level of English. This can be determined by the English school average that is lower than 10.