Looking for a particular book from 50+ years ago – science fiction reader

I'm looking for a particular book, but I don't remember the name of it, I saw this sub suggested as a possible source.

It was a science fiction book with multiple stories in it from the 1970's. It was giving to all the students in the class, so it could have been published in the 1960's as our school didn't have a lot of funds for new books. The only stories/authors I remember from it were:

1) Sun Jammer by Arthur C Clarke

2) Grandpa by James H Schmitz

3) All Summer in a Day by Ray Bradbury

I know I could find all these stories/authors in separate books, but I'm hoping to find the original book I had in school or something that has these particular stories in one book.

I know it's a strange request, I'm trying to relive my childhood 😉