I have been using oxys for 3 months almost daily (60-80mg). I have a preemployment (preaccess express test) in 8 days. Should I worry? Can I pass? Help!

It depends. If you have a legitimate reason to be on them then you should be able to get a letter from your doctor. If you are using them illegally, then it will be difficult to go cold turkey as with those doses you'll likely go through widrawal. You'll need several days of being "clean" to test negative. .
Well... If you tell the truth before the test, it will make it easier. But the drug will be detected.