I'm thinking of taking the CompTia A+ exams - two of them. I decided against doing the course and have bought a (thick) book instead, which has test exams on a CD. It's a comprehensive book. I sailed through the OS exam but failed the Core (hardware) exam - 78%. I need around another 10%. I need to somehow remember all the various CPUs, their speeds, caches and connection methods (Slot 1, Socket 8...); connectors and cabling (e.g. the yellow wire on a molex is what voltage?); typical DMA, IRQ and I/O addressing; and finally, networking standards - e.g. distances between devices on a hub.
Anyone any useful suggestions on how I might remember this lot

Maybe memory aids or mnemonics? Or is it a case of decorating the house with post-it notes?