Who goes to the US for a night rating?
Unless you're there for a day and fly home, it would be hard to say the NQ is the primary reason for the visit. If it's combined with hour building then, again, the NQ is not the primary reason for the visit.
A NQ is not a full course of study, so don't waste your money on the visa or the school which is happily charging you $200 for processing the paperwork for you.