Study up on basic algebra and functions, that will be the first part of the test. The second part of the test will be reading comprehension.
IF you pass that then you will be given an appointment for an interview. That interview will be in front of a board panel comprised of NECA and IBEW members. This interview is the true deciding factor (given you have made it this far) for acceptance into the apprenticeship program.
Hope this helps, and BTW, at the risk of karma, if you make it through to the interview, pass the interview and get accepted into the apprenticeship and I do not, .....I will have lost what little faith I have left in humanity.
Keep us posted.