Quizzes are cool, but the real learning will be applying what you learn one step at a time. I was never excellent with quizzes, but it is a good option to consider. When one thing isn't clear zoom it on it and do a lot of lateral background research and "ask questions", be it on a forum, call repair shops near you, or just go ask some kid at your local library. Kids seem to know everything these days. Remember youtube is a plethora of knowledge and can often answer whatever basic questions you have.

__________________
Cooler Master HAF 932(Full Tower)
Intel® Core™ i5-750 Processor
(8M Cache, 2.66 GHz)
ASUS P7P55 PRO Motherboard
Samsung S27A550H 27"
(Class Widescreen LED HD Monitor)
5 WD scorpio black HDDs
2 DVD writer/burners
WIN 7 Ultimate X64
8 GB of RAM

"The only problem with troubleshooting is that sometimes trouble shoots back."