First time doing mock tests. I did the N5 and N4 tests. I don’t understand the grading.

So, I wrote down my raw scores.

N5 test:

Vocabulary: 30/33 (as in I got 30 questions right out of 33) = 91%
Reading: 28/32 = 87%
Listening: 21/26 = 81%

Average: 86%

N4 test:

Vocabulary: 32/36 = 89%
Reading: 29/40 = 72%
Listening: 17/28 = 61%

Average: 74%

So apparently I passed both tests. But what I don't understand is how they scale it. How do the scores on the results sheet correlate to my raw results?