I have only just seen your post, so hopefully you had some good news in the second round earlier this week.
I am assuming you are on the outer area list for Watford as my son scored 247 and is 16th on the list - or he was last time I checked just after allocation day.
If you haven't done already, get him on the CI list for Clement Danes as he missed getting a place there by only 1 mark in the first round. My son did get a place in the first round at CD, although he is likely to give it up for someone in the next round - it was his third choice and this week he got offered his second. Watford was his first choice but at 16th on the list for 19 places I don't think there's much chance of him getting in. Let us know where your son ends up.