Small sample size alert (16)! Have just asked DDs about this and they counted 50% success rate, all applicants with 3 or more A*s. Success rate far higher at Oxford, all a different college, some science/engineering but at least 2/3 humanities/arts/languages, none for maths.
However, obviously a small sample size and many will have different stories. I would ignore the data and focus on DC. Do they want to try again? Why? Is that really good reason? How will they cope with another disappointment? What else will they do with the year (one of DD2's friends appears to have done absolutely nothing, got her offer but has been very bored and profligate with the opportunity to develop herself in other ways, sadly. How much will it drive you mad having them at home going through this again

(not entirely a joke, but largely

). What has changed that makes them think they might get in this time? How will they feel if they don't give it a go?
If DC decides to go for it make sure he/she treats it (the year) as an opportunity and have a plan for more than just resitting, particularly afterwards. If they decide to go for it make sure they realise that they are no longer a school child and need to pull their weight around the house, financially etc. Make sure they have plans of what to do no matter the result and so will gain something either way. DD1 considered it and decided against. She has never regretted it, despite her best friend re-sitting and getting in. But that was her and this is your DC. Good luck either way and whatever the decision don't look back.
