I remember reading a load of Blyton books when I was a kid but the ones that stuck in my memory was a series called Mallory Towers
heres the synopsis

Malory Towers

Malory Towers is a boarding school for girls in Cornwall. Enid Blyton wrote six books for this series between 1946 and 1951. The heroine is Darrell Rivers, who enters the school in the first form and becomes head girl when she is in the sixth. But of course it's not all plain sailing for Darrell and her friends!
Malory Towers has six forms, from the first to the sixth, and four house towers—North, South, East and West. There are about forty girls in each form, divided among the four houses. Darrell and Co are in North Tower, where most of the action takes place, and where the girls try not to run foul of strict housemistress Miss Potts, or the equally strict Matron.
How I came to start reading these I cant really remember, as a boy it was not the done thing to read a bunch of books about a girls boarding school, but when I started to read I just couldnt put them down , and now i must have re-read then dozens of times , Wonderful stuff
So whats your favourite

I read all the Famous Five books as a Kid and loved them .

I was more an Arthur Ransome reader, Swallows & Amazons forever.

I loved anything to do with horses and read and re-read the My Friend Flicka, The Silver Brumby and Jill's Gymkana series over and over.
I also read the Famous Five, Secret Seven and Nancy Drew
Started on Steven King  by the time I was 14

i never read the books,but did like the famous five,when they made it into a tv series though.

Malory Towers!!! Loved these books! Also don't forget "St Clares" same thing, different school and twins this time Pat and Isabel I think (long time ago!)

 I was the BIGGEST Enid Blyton fan. I Loved the Famous Five and The Secret Seven. Also, anyone remember the " ....of Adventure" series..the ship of adventure ,the river of adventure, the castle, the island , the circus etc etc I had them all. I still have all these books.

Just went and checked another one off was called "The six bad boys"  I also loved her fairy stories and Noddy when I was younger (So UnPC now..those naughty Golliwogs!)