Becker does a good job overall, as good as possible anyway. It would be too time-consuming and inefficient to spoon feed you ALL the material and have you understand who/what/when/where/why/how for every single topic. It's a lot already, that would be insanity.
For MCQ's, I cannot recommend them more! Do NOT skip MCQ's, since they help you gauge how important certain concepts are from the lecture materials. I know it's discouraging sometimes when you get a lot wrong, and they aren't so useful if you just click and move on. But if you take it slow, read the explanations for the ones you don't completely understand, and move along that way, then you will do well. It makes the exam feel like you are just doing some homework (except MUCH easier than some of the craziness Becker throw at you).
I wrote up a cheat sheet at the end of all basic calculations and notes that I did not recognize on final review or felt I wanted to emphasize. Honestly, govt/nonprofit is just weird. Learn the basic concepts like fund types, basic entries, conceptual requirements, and the like, and you should be okay. The most important thing is to periodically (every few days/weekly--depending on how long your study period) review older things. Don't focus on getting everything, but just jog your memory on older topics so you don't have to relearn much during final review. Good luck!