The "test" is age-specific.  If you're one of the many millions older than that? For this upper-middle class reader (age 70) certain components aren't relevant: 
1. Your mother graduated from university. 
My mother never attended university.  Heck, she never learned to drive a car!

I went to "community college"--didn't struggle (struggle came later, in my late 50s as I suspect many upper-middle incomers in their 50s continue to do.)  Had a terrific career and still enjoy an upper-middle class life.

Other debatable statements: Class is "the divide between the educated elite and everybody else."  Today, being "educated" is no definition of elite membership when society is flooded with degree-holders.  67 years ago, when my father earned his degree, HE was a member of the "elite."  Not his 30-something grand-daughters.  

My daughters could check off almost all test components. They'd laugh if you said they were members of the "elite." To them, it's somebody else.