Ryan is a brand name and it has various branches across Delhi. One of the branches which I have seen and been a part of is Mayur Vihar one.
The teachers are well-educated with focus on both academics as well as sports. The good location of school also proves to be an added advantage to school. To see review and ratings of Ryan Mayur Vihar is here:- https://justdakhila.com/best-day-school/east-delhi/ryan-international-school-in-mayur-vihar-iii/824