I am the very last person to suggest ever choosing a school on its league table performances, but you might want to look at some comparison data (exam results; the Progress 8 measures which were released yesterday) between Ribston and some local non-selective schools
if your choice of grammar school is based on a perceived academic advantage.
Let us say that there is no clear reason you would choose it over many others if this is your top criterion.
If you are choosing Ribston for other reasons, for example because it is very close to where you live, or because it offers things which your daughter especially loves, or you just like the place and it feels right when you go in, then that is another matter.
I've done a progress8 comparison for you on the three schools you mention plus two others - hope the link works.
https://www.compare-school-performance. ... =secondary