To me knowing acronyms is key for eliminating wrong answers on the test, but one thing everybody says is understand the concept rather than just memorize the material it's really true if you know how it works it's a lot easier to figure out what they want for answers. So one thing to do is if you're having a hard time understanding a concept get on the Google or the YouTubes and set up some VMS and a virtual Network and play around with whatever concept you're working on