I read and loved them as a child. Re-read them as an adult with quite a different view.
As a kid, that beautiful, soft grey, romantic building set on the beautiful Cornish cliffs (apparently based on Lulworth Castle) with a pool based on Dancing Ledge struck me as idyllic. As an adult, it appears more as a hideous correctional facility designed to break people! Few students are spared the laser-precision accuracy of Enid's unfailing snobbery. The Americans are vapid, obsessed with the cinema and their appearance, and grow up too fast. Eyes too close together? You're sly, with a secret to hide. French? You're totally credulous and will fall for any trick, no matter how transparently stupid. The nouveaux riche are insupportable; cf. that appalling Jo Jones, who fully deserves to be rusticated in Enid's opinion. 'Swatters' are spared no degree of scorn, it's a sin to be too clever, and if you don't like sport, you're heading straight for Coventry and a much-needed spanking with a hairbrush.
'In the Fifth' is the most gratuitous of the lot, but I 100% understand why Gwen would feign a weak heart to dodge school cert and GTFO of the fucking hellhole! I like Gwen. She is a scapegoat for all the failings of the others, who for some indefinable reason the author thinks we should look up to and admire. How is she worse than Daphne who steals, Bill who is deceitful, Mavis who's conceited, Alicia, who's as catty as they come. Belinda is an out-and-out bully, and as for hero Darrell, she's a thug, always happens to pick on those weaker than herself, but is forgiven every behavioural transgression because she's sorry and ashamed afterwards and is rewarded by elevation to the coveted position of Head Girl.
Bad show, Miss Grayling! (completely ineffectual and useless Headmistress).
But I loved that scene from 'Fifth Formers at St Clare's', when Mademoiselle apparently encounters a whole gang of burglars in one night. Straight out of farce, and unusually funny for Blyton!