In a typical, non-selective prep in SW London, it would be like this (based on having seen it three times) -
SPGS - top of the top set for maths and English to even have a go.
G&L, LU - top few from the top sets to have a go.
LU put a lot of emphasis on the interview and take the more “confident,” articulate types. Maths exam very extended for that school. English comprehension is multi-choice but tricky. Very liberal, fast-paced, “buzzy” kind of school.
G&L exam is an unknown quantity really, but school is fantastic for a more “quietly confident,” academic and focused girl. Very kind supportive atmosphere in the school.
PHS - anyone in the top set for Msths and English should have a go and usually quite a few get in from the middle set too. I’ve known girls to get scholarships there from the middle maths and English sets.
WHS - again girls from the middle sets get in for sure, but the process seems more random here.
FHSS - suddenly much more selective in recent years and no longer a “back up” to PHS etc (as last year’s GCSE results considerably higher). But definitely worth a go if your DD is sitting the consortium exam for G&L anyway.
LEH - quite far our for some, but similar acceptance rates to PHS or FHSS in terms of the girls who are offered places.
What you find is PHS, LEH and FHSS offer a lot of scholarships - sports, music, academic or combos of these - to tempt people away from SPGS and G&L. G&L do not offer scholarships (apart from one only in music).