When I started teaching gymnastics, I vowed to myself that I would not be like those other teachers, who had no regard for the consequences that might occur from the decisions they made to further a program. I did not want to see what happened to me happen to other kids.
My modus operandi: If I had a situation like this, where two friends came to a beginner class and one was clearly better at skills than the other, I would approach the parent(s) regarding the matter before telling the kids about moving to the next level or not. If it was going to cause an issue with friendship or possibly arrangements for attending class, then I, as a teacher, could make other accommodations for the kids. This might entail re-writing my lesson plan and working harder in teaching the class, but that's what good teachers do.
Veda, in Sanskrit, means knowledge.
From The Mahabharata: I The Beginning, translated and edited by J.A.B van Buitenen, (1973). Chicago: The University of Chicago Press.
Now Dhaumya Ayoda had another student by the name of Veda. Him his teacher instructed, "Veda, my son, stay here. Spend some time obediently in my house. Fortune will befall you." He gave his promise and lived for a long time in his guru's house, obeying his guru. Like a bullock forever yoked to pull burdensome loads, he endured the miseries of cold and heat, hunger and thirst, and was ever compliant. After a long time his teacher waxed satisfied with him ; and because of his teacher's satisfaction he attained to fortune and full knowledge.
Thus was the trial of Veda.
Having been granted leave by his teacher, he returned home from his teacher's lodgings and entered upon the householder's stage of life. Three students came to live with him. He never told his students anything like "Observe this rite, obey your teacher" ; since he himself knew the sorrows of lodging at a teacher's house, he did not wish to burden his students with vexations. (p. 48)
These ancient stories and texts were put to paper for a reason -- to help others find their way through life, to help us understand and navigate the human condition. The same issues and circumstances we find ourselves in today have all happened before and they will continue to happen again with future generations. Some of us can find the knowledge within and apply it to their daily lives. Some of us need extra help to do so; hence reading and seeking knowledge from all venues and not limiting yourself to your own little world, culture, nation, or religion, BUT being open minded to other possibilities and ideas is better for human kind in every way.