I'll not help you with a test, no.

But if you want to practise before then, I'd advise:

• Re-read some of your old code, if you have it
• Try to write some very simple code to remind yourself of things. Pick a trivial task from a basic programming tutorial (find prime numbers, sort lines in a file, that sort of thing) and see if you can implement it.
• Read FAQs and the perl docs (e.g. perlboot, perltoot, perltooc for OO perl). Start with the ones which make sense to you as a refresher, to get some confidence and then try and tackle some of the stuff you find harder.

Good luck, and remember to be honest about your levels of ability and skill with the interviewers.

If someone claims they know everything about perl and does only 'OK' on a test, that's a definite 'no hire'. If someone does 'OK' on a test but says that they are a bit rusty and they have haven't done too much perl recently, then that may be a different matter.