What is Customs MET exam?

There's no widely known or established exam called "Customs MET exam." There are many exams related to customs work, depending on the country and the specific job. To answer your question accurately, I need more context.

For example, "MET" might be an acronym specific to a particular customs agency or training program. Could you provide more details such as:

* Which country are you referring to? Customs procedures and exams vary significantly between countries.

* What kind of job or role is this exam for? (e.g., customs inspector, broker, analyst)

* Where did you hear about this exam? (e.g., a website, job posting, etc.)

With more information, I can help you understand what exam you're asking about.