Passed all 14 on the first try myself, lowest score I got was 92% (enough bragging).
I got all the 14 Oxford books, and studied them for about 5 months, and used the Bristol (atpl.gs) question bank a lot as well to find subjects to read up more on.
Btw it's total bull**** that you need a CRP-5 (crap 5), I used an E6B and didn't find anything I couldn't solve (only thing I can think of will be airspeed corrected for compression, and specific gravity questions, but these can easily be solved on a calculator as well. Especially SG).
Only thing you need to make sure of is that your E6B has a high speed wind side, otherwise there are some nice, more advanced flight computers you can get in the US for a fraction of the price of a crap-5.

Good luck, and send a PM if you have any questions