One of the things that indie preps are usually keen to show you is the "leavers list" - often for several years.... will be clear who is going where and also you can then see what the "selective" indies are like and how many go to GS etc. One concern I have though with these lists can be that some poor kids seem to have done (and passed) a stream of exams..... they may well have done just as well anywhere.
Must say when I chose indie primaries I hadn't a clue about the standard
just liked the atmosphere and the set-up. One very specifically made the point that it had a non selective intake at age 3 and although many did well in exams at 11, they were confident that the kids were going to the schools right