Go to war to find out?
You idiot. Anyways we already have engaged them and we know how good they are. They're damn good. But not unbeatable. Incase some of you didn't notice, both South and North Korea sent special operations people to fight each other. North infiltrating South, South infiltrating North. We know the North Koreans are extremely well trained and their best of the best should rank among the most elite in the world. What do you expect? Their training doesn't have to answer to public opinion in any way.

The question was just how many? Basically if you want to give something an overall grade, you have to take the overall force into consideration.
North Korea's vehicles are in TERRIBLE shape regardless of military branch. North Korea has a lot of tanks on paper, but their crews are either poorly trained or untrained because there's not enough fuel to give them adequate training and certainly not enough money to have a simulator training facility.
They haven't changed their artillery rounds in decades, which prompts the question: are those rounds they fire even going to blow up?
This is why North Korea's Army grading is low.
Just one special operations outfit, who's numbers are unknown can't suddenly boost it to grade A.

Interesting opinions, NK is overrated.

Yes all of the commi nations in the list are overrated and Russia is underrated, if Russia would want to attack someone then almost hole budget would be put at the military..