I just passed my NETA 2 on the first try, huge thank you to the others on this board as it was a huge help as well as the practice tests.
I have been around the industry awhile before going towards NETA (mainly maintenance) which did help significantly with the test, personally I think some of it can only be learned from field experience.
Some advice for less seasoned people going for the test is to not get discouraged, the practice exams on here are harder than the actual test for the given level (at least for me).
Read the questions carefully as they are very similar to the practice test, but not all are the same.
Cheers!