A lot of workers in non union jobs work hard and never receive what the Union gets for us. Hard work is good for you, and makes you feel good. Knowing your limits is smart and also makes you feel good, and empowered.
You know what your limits are, and no one, not UPS or the Union can do it for you, though they will try.
All that aside, you need to look at qualification for what it is; a test. Your score on the test will depend your own herculean effort, skill, care, determination and a touch of good luck.