No need to panic.
Are you currently instructing? If so, you should be current on regs and Jepps.
Do not postpone that interview date unless you want to wait another three months. Maybe.
Search this forum and all the curveballs that are usually thrown in the interview have been discussed extensively.
Search the other online gouges, they are dead on.
MZT is like any other DME arc, find an arc and finger fly it. Be sure to brief the MSA and missed approach etc. Imagine you are flying a jet, when do you start slowing down and configuring etc. and how would you lead a turn? I think I remember seeing even this stuff on a thread a few months ago.
Good Luck and it is likely you will get a West Coast base and a class date of 1-3 weeks of when they offer you the job.