Current Job Prospects for a National Test Pilot School Graduate?

There are production test pilots and experimental test pilots. Most test pilots are production pilots and the job is rather mundane, taking a newly built airplane or recently repaired one up for a flight to check that it flies properly. Experimental test pilots who fly new designs to investigate their performance and stability are few and far between plus new designs come along so infrequently that even experimental pilots rarely get to fly a new design. As far as danger new designs are thoroughly tested in flight simulators before the airplane is flown and the techniques used to predict how it will fly are so accurate that there's rarely a surprise.

National Test Pilot School

Get an engineering degree and become an Air Force pilot first - You might become (might) a test pilot at a much later time (when you get experience in jet aircraft) - You have a PPL... fine - That is of NO help to get you to the Air Force -

First step is college and Air Force, all the rest comes later, much later -

incredibly some the educational tiers for the positions indicated above are, to place it with politeness, incredibly unrealistic, e.g., a 2-365 days degree for an electric or mechanical engineer and a extreme college degree for a application engineer.