How to read Math Placement Exam score?

When I got my exam score back, it says I got a 28, but it actually equals 24. Did A&M grade my test wrong? I know that I should get a 22 or higher on it to enroll in MATH 151.

TAMU Math Placement Expo: 4

TAMU Math Placement Func: 4

TAMU Math Placement Grph: 4

TAMU Math Placement Poly: 4

TAMU Math Placement Prob: 4

TAMU Math Placement Trig: 4

TAMU Math Placement Total: 28