I normally run off the scale at 195+ but I've found it really depends on my mood and the test environment. I do best sitting in a bar with a beer in one hand and a cigarette in the other, but that's probably just from being an ex-journalist and spending most of my life living in pubs around Fleet Street, of which there used to be a great many!
My last official (MENSA) test, however, I only got 141-150, so that's what I ticked for this poll. I could make the excuse that I hate exam rooms, hadn't slept for 36 hours, hadn't eaten for 18 hours and was sloppy drunk at the time having just sent a newspaper to press but ...Well, mostly I just got bored and the invitatation I hod to help a bunch of newly qualified doctors celebrate in the pub just across the road was so much more appealing.
I mention that because, being bored and in need of a drink and a cigarette, I just killed the last two sections of the IQ test ticking off boxes at random. I think that's when I lost faith in IQ testing as a science. I scored higher that way than when I was trying. *L*