I just passed the core (with 595 so didn't exactly ace it) and found it a lot harder than I had thought it would be. There were a lot of questions I hadn't come across on any of the exams from this site, michael meyers' CD, mcmcse, or freetests. About half of the questions were troubleshooting, many of which I had to guess. Lots of the networking and peripherals questions used product specs and abbreviations I don't remember coming across. Not one IRQ / I/O question. I studied a lot (or so I thought) and still lots of stuff stumped me. Maybe if you work with this stuff, you will find it a lot easier than those of us who just use books & tests. Thanks for the tests and tips on this site. Gotta get revising for the OS now...