Adding up those figures that is 930 places with sitters of just over 2,000 (taking 250 as a random figure for Ribston) which is a pretty good odds compared to the grammars DD sat last Sept where 950 girls sat for 160 places for the girls school and approaching 2000 for the 120 places for the boys school, the discrepancy being the former has a catchment of 9 miles, the latter the whole of the country. If sitters are going in your region for more than one school the odds may be even better. Just to give some perspective.
A couple of points re the Gloucestershire grammars:
- they are all superselective, so like St Olaves have the whole country as their catchment (and although the few members of my family who have attended a grammar school there only travelled a few miles to do so, one thing I have gleaned from this forum is that there days, some send their children from as far away as Bristol)
- you register your child to sit the exam at a school of the relevant gender, but can choose to 'share' their score with any or all of the others (of the relevant gender); so a girl registered and sitting the exam at Stroud High may or may not have her score standardised in the cohort for Pates / HSFG / Ribston Hall. So you may actually be competing with over a thousand for a place at SHS if you are only interested in a place there for whatever reason, but all the other girls sitting the exam opt to be included in that cohort.