Because Koreans often omit some word in their sentences, I can't be sure what it exactly means. It can mean "how can I get to the school", but it also can mean "How do you go to school" or "How should I go to School". It depends on what the asker wants to ask and what you and the asker talk about.

@David: Thank you!

Which part of the sentence do you think is difficult to understand? I'm not Korean. To me, it means - how can I get to the school? The speaker could be asking for directions. Let's wait for an answer from Korea. :P