In a certain code, "48" means "which school" and "968" means "college and school". What is the code for the word "school"?

Comparing the two coded phrases:
1. "which school" $\to$ 48
2. "college and school" $\to$ 968

The only common word between the two phrases is "school", and the only common digit between their numerical codes is 8. Therefore, the code for "school" is 8.