Difference in quality of teaching between lessons in school and private lessons
Question

                What is the ruling on the difference in teaching quality between lessons in school and private lessons, with regard to explaining things properly to the students?.
Praise be to Allah.
    What the teacher must do is do the work that is required of 
    him, and not fall short in explaining things properly, whether he is 
    teaching in the school or elsewhere. What some teachers do, whereby they 
    fail to explain things properly in school but they explain very well 
    elsewhere, is a kind of betrayal of trust and deceiving the students and the 
    school. 

    But if he does his work properly in both places, but he does a better job in one due to external factors such as having more time and fewer students, or because the students are smarter or of a similar level, and the like, then there is nothing wrong with that.