4

This question already has an answer here:

Read this as a kid in the early 80s.

Two boys in our world get in a fight at school, but when they enter the principal's office they are transported to a parallel world. As I recall, they had to work together to save that world by finding several magic items (one was a thread, I think?). And in that world math and poetry were magic?

Anyone remember this?

marked as duplicate by eshier, amflare, TheLethalCarrot, Vanguard3000, RDFozz Jan 23 at 18:51

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

8

The Hero From Otherwhere by Jay Williams. 1973.

Two boys who are enemies at school find they must rely on each other when they are transported to a strange world parallel to the one on earth.

An example cover is shown below taken from Library Thing, click the link to see a couple of other ones.

The Hero From Otherwhere front cover

Not the answer you're looking for? Browse other questions tagged or ask your own question.