Pre-University education in the UK lasts 13 years, the last 2 of which are specialized training in the University. The results of these two years, the graduates take exams called A-Levels, or equivalent. As secondary education in CIS countries lasts less, then the Certificate of complete secondary education is not enough to apply to universities in the UK.
There are various ways to "get" the missing years of schooling for admission to universities in the UK. This can be done in the UK (A-levels, Foundation, International Baccalaureate), and in his country (International Baccalaureate, universities at home).
Usually teachers and psychologists recommend to begin the education abroad at the age of 10-13 years, so the child has time to fully adapt to the education system, language and culture. However, if the idea of a University in the UK came to You late, You also have all the chances of success.
How to transfer to a British University from the University in the CIS?
How to enroll in the University immediately after high school?
How to apply for a first degree in an English University?
The competition for admission statistics and admission of students from Russia