I can show you them broken down by subject but I can't show you other groundschool's pass rates. The CAA consider that commercially sensitive. You've got to watch out for statistics quoted by flight schools:
"100% pass rate in January" = "both our students passed"
"85% average in March" = "True, but don't ask about February or April"
"85% first time pass rate" = "It's the re-sits that drag our marks down"
"Best pass rates in the UK" = "We can't check this but no-one else can either so its worth a shot, someone might believe it"
"Best pass rates in Europe" = "We're trying it on, how gullible are you?"
The pass rates by subject for June are
here. They also include our students' pass rates. If anyone objects to this I can chop the link.