Cambridge could get a person with 12 A* GCSE's, 5 A grade A Level predictions, great personal statement and then at the interview feel that you were too boring to be on the course, or that you didnt really want that course as much as other people who have less academical achievements! Afterall, go on the cambridge website and look this up for yourself- there is a way to apply for cambridge if you dont have good grades- but if you show a willingness to learn and total dedication and enthusaiam for the course! Now if that isnt showing what their main assesement points are- then god knows what is!