I cannot see what difference it would make if you knew someone who went to Oxbridge or other top universities, what exactly would that prove about the European school? Judge a school for what it teaches, what the children learn, what extra-curricular activities there are, how long it takes to get there etc etc, but not on the say so of someone who went to Oxford or Cambridge from there. If you then met someone who failed to make it to any higher education institution after European School, would that mean that is not a good school for your son? Sorry, I don't mean to respond so negatively to your question, but I cannot see what you are going to gain from responses.
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