The exam is fairly straightforward. The grey Thom book and the IMC confuser should do you just fine. Just remember that the approach minima for the IMCr are in real life exactly those of the IR. The exam and the propoganda will have you believe that 500/600ft are the absolute minimums for IMC holders, which is, in fact, bollocks. If you get a question on DH/A or MDH/A, use the 500/600 rubbish, not the truth. Stupid, but true.
The flying can vary depending on where you do it, but mine consisted of: general handling, climbing, descending, partial panel, unusual attitudes, navaid tracking, SIDs, holds etc.. I think I did almost all the possible approaches, including NDB/DME, NDB/ILS, LOC/DME, SRA, VDF. Holds aren't mandatory in the test, but if you get put in the hold (as I did), you'll be evaluated on it.
My test consisted of flying a POL1W SID out of LBA, then intercepting the 015 radial tracking to Skipton, do a position fix, do some general handing, partial panel, timed turns and unusual attitudes. Then tracked back to the NDB, spent 15mins in the feckin hold and into an NDB/ILS. Went around at DA (the propoganda version) and did a 500ft AAL circuit to land. Job done.