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Age limit for admission to the University of Cambridge no. However, if You are going to enroll in a British College, in 12-13 years You should start to explore options to tighten the language and keep track of progress.
The prestige of the school still is of great importance when considering the application to the University, but this does not mean that it is the determining factor. The surest way to prepare for a high-rated school will be the passage of a special summer course at one of them.