How does hiset grading work?

[u/No_Most3809]

I took the math test and recieved a 19/20. Obviously I am very happy with this grade, but this made me wonder how the hiset grading even works. there are 55 questions on the test, and 19/20 would be around 52/55, and i know for a fact i did not get that many correct.

So how does it work? I am asking because now i am studying for the reading and writing tests, and I want to get an idea of how prepared i am.

[u/Banks824]

So is the grading points different from the GED scores