My suggestion is to stop using the dump, dumps are not helpful for learning. They will help you pass the test, but that doesn't mean you have a clue as to what you are doing. The result is that you have credentials, you get an interview, and completely fail the technical portion of the interview ... I've seen people cry because they felt so stupid. Creds get you in the door, you are expected to know the material; if you show weakness, you'll get hammered because the interviewers hate having their time wasted and they take it out on you and the agency that sent you. Pretty soon, the agency won't send you anymore.
Get the books, read the books, study (but not brain dumps). Learn subnet so well you could do it in your sleep without a calculator. Learn IPv6, even if it's not in the books; many places are moving to IPv6. Learn to know the material, not to pass a test. If you know the material, there is no "trick" test question, and even if they change the tests at the last minute, you'll still make it through because you know WHY something is the way it is; you can adapt and figure out the problem.
It is easy to spot someone that knows versus someone that memorized.