“Check out” is actually a C1 level phrasal verb, but candidates may find they have an opportunity to use it in the B2 First exam. It has a few different meanings, the obvious one being the action of leaving a hotel after a holiday, but at C1 level you can use it to describe the action of taking a look or seeing something interesting.
…it’s great that you are coming to Madrid. You must check out Retiro Park when you are here, and don’t forget to visit the Prada museum as well…
Examiner: “Do you like trying exotic food?”
Candidate: “Yes, I love trying all sorts of different food. Whenever I visit a new country I always check out the local dishes…”