Another one for Airquiz - considering you get all the subjects for £20 vs. 30 for a single written resit, it's great value for money. Plus it's constantly updated (see News at the top). I remember several questions with out-of-date answers on the Trevor Thom books, airquiz had the correct data. The tricky ones also have an explanation with pictures/graphs etc.
On the down side the wording is completely different (intentionally?) from the CAA papers, so in response to
BobD I would expect the same for the IMCR.
The "Exam Secrets Guides" have questions taken directly from the exam papers, no IMC book yet.
I bought the whole lot - money well spent