Riverdale and United Nations International School (UNIS) Social Life

<p>I'm considering attending either Riverdale or UNIS next year. However, I do not know much about the social scene at either school. Are the kids nice? Is it competitive? Are students accepting of students entering in grades such as 10th or 11th grade that aren't typical entry points? Is it harder to get into college because you don't stick out at these schools? How are each of these schools socially? I appreciate your responses! </p>