You'd better communicate by phone before you go. Whether this position is still open, make sure whether you can go directly to the interview, which interviewer to look for during the interview, and then check the route after you get the definite answer, so as not to make a trip in vain.
You can carefully prepare a resume of this position before you go.
4. The questions that the examiner is expected to ask during the interview should be prepared in advance.
5, pay attention to dress.
You can go when these are ready. Good luck.