Don't know the 'IMC Questions and Answers Simplifier' but I took the test over the summer. It was 25 questions, quite a lot of them on a navigation exercise similar to (but more precise than) the PPL nav exam, plus radio nav, weather, instruments & failure modes, rules etc. A reasonably tough exam but perfectly manageable if you've read the books and done some question practice. I've heard that Oxford Aviation have a good but expensive IMC training DVD.