Setting: Present day Moscow. Any neighborhood will do, but her family has never been rich or completely destitute.
Character: 17-year old girl
Question 1: When do students graduate from secondary school. As in, what month?
Question 2: Are there any notable, culturally distinct rites of passage or rituals she should know?
Searches: Wiki and Google; keywords: russian school moscow graduation, russian "rites of passage." Wiki gave us a basic idea of the educational system, but not when secondary school students graduate. We're looking for months and maybe a general idea of a day.
For the second question, we'd like to see personal accounts too if it's possible.
Thanks in advance!