OMM or Danny are good bets for a heads-up on what roughly you'll be doing in phase two training, I'd have thought.
From an AFCO perspective we aren't briefed to advise WE's to revise in preparation for joining and one assumes that your Recruiting Test score is a good enough indicator for your readiness to undergo branch training, but I'm happy to stand corrected.
Basic electrical engineering . capacitors and how to add the totals up in a circuit . How to calculate capcitor resistance in series and parallel . They teach you everything in Collingrad anyway. How do I know? Because I helped my girl revise for it while she was home one weekend. Thats the hardest part of the course it seems. OHM's law learn that.
Can you install windows? That was another thing they learnt if they didnt already know how to press the OK button or NEXT. Componants in a PC and trouble shooting circuit boards. All taught at Collingwood , why do the instructors out of a job eh?
Theres some decent web sites that show you how to calc all that just do a search.
As Danny below says brush up on you maths if its rusty. Refresh how to rearange a formula to get the result you want using OHMs law to practice with.
Phase two is really basic I don't think there is any need to swat up at all, they will teach you everything you need to know.
But depending on when you left school a quick refresher on basic maths wouldn't be a waste of time.
Design a mess call up system that works. This is something that has evaded the WEs I have worked with for the last 33 years. You must also be good at getting to watchkeepers scran, watching DVDs, guarding the mess and drinking Champaign when the 4.5 brick throwing device goes bang. Bitter, twisted, No. An ME yes.
Try Everyday Practical Electronics, it's a monthly magazine with projects etc but does some good regular features and teach ins on electronics and theory. Every circuit as a project is described as to how it works and what does what.
Ive recently left as a WE after time done and I did electronics as a hobby from age eight. It gave me a good heads up and really to get on and progress it's best to know what your seeing when you see it.
As others have said, Collingrad will tell you all you need to know but I would advise swatting on maths, ohms law and parallel and series capacitor and resistor networks
Good luck and enjoy it, I have a huge workshop full of electronics now and I'm always building gadgets. The navy gave me that interest more than my then hobby.