Well, let's look at the factors in play:
Being a trusted user wins 20 scores. In short, each 1k rep till 20k counts as 1 score, and the rep gets truncated. So, for me, someone with 2768 reps, it's 2 scores, outta 20.
(Shamelessly copied from the meta.SE post on this very nominal occurrence)
Civic Duty, Cleanup, Deputy, Electorate, Marshal, Reviewer, Sportsmanship, Steward
Each count as one. So I'll get a 5/8 as I don't have
Copy Editor, Explainer, Organizer, Refiner, Strunk and White, Tag Editor
Just as my English vocab book says, instructions as above. For example, I miss
Copy editor and
Refiner, so I'll get a four outta six.
Constituent, Convention, Enthusiast, Investor, Quorum, Yearling
Instructions as above.
A final note: These standard were set for huge sites like I dunno, ELU, Math.SE, SO and so on. So I won't be ashamed of the low score most of us get. You shouldn't too. :)