This is called grading on the curve:
The decision in England, where results come out on Thursday, is more rigid still: alongside their predictions, teachers were asked to put their students in order, with none jointly ranked. Then, in what Ofqual called its “direct centre-level approach”, the predictions were largely disregarded; instead, schools have been allocated a fixed number of As, Bs etc based on their performances in previous years. Students’ results will rely jointly on where they were placed relative to their peers, and how students did in the years before them.
The aim is to sort pupils into bright, not so and not. So, rank order does this. What is your problem?