The baby sitters club books! I loved these when I was a kid! Read them all.my sister had the Babysitters little sister books. My girls are now reading the little sister books we found at a book sale recently.
Sideways Stories from Wayside School, by Louis Sachar. (Avon Books, Humorous episodes from the classroom on the thirtieth floor of Wayside School, which was accidentally built sideways with one classroom on each story.