Note that 面试 is the kind of interview you have when applying for something, not an interview by a journalist (that's 访问 fǎngwèn and the corresponding verb "to interview" is 采访 cǎifǎng).
"i have to prepare for this interview" was rejected but I think it's ok
It's accepted now.
Do we really need 为 here?
Do we really need 为 here?... what is the purpose of this particle in the sentence_