It's really tough to say. Online IQ tests are notoriously unreliable, so I wouldn't sweat that too much. And if you average out your two scores, you still get a

It's really tough to say. Online IQ tests are notoriously unreliable, so I wouldn't sweat that too much. And if you average out your two scores, you still get about 110 which is above average (IQ is defined so that 100 is the mean). Also consider that your "low" score would put you within one standard deviation of the mean (stddev for IQ is 15), and your "high" score puts your three stddev's above the mean. Being within one stddev either way would put you in the same overall intelligence "bucket" as 68% of the people in the world, which isn't bad. And you may well be higher. Consider that that "high" score puts you three stddevs above the mean, which would make you a real outlier and far more intelligent than average! So yeah, I wouldn't walk around assuming that you're fundamentally lacking in intelligence, barring some other evidence to suggest so. :-) As for the rest, it's very possible that your problem is rooted in either your approach to preparation for the interviews, interview anxiety, or - as other have mentioned - possibly ADHD or something. I will just say this: I've often found that ability to communicate clearly correlates well with observed intelligence (that is, people who communicate clearly are often good at "doing stuff" productively for various definitions of "doing stuff"). And your communication here, in English, which I'm assuming isn't your first language if you're from Russia, is good enough to make me think that "lack of raw intelligence" is probably not a problem. Yes, that's very subjective and vague, so take it for what it's worth. One last random thought: I agree with the folks who said "see a doctor about possible ADHD". But in the event that you either don't want to do that, or can't do that for any reason, one thing you might try is consuming a little L-Theanine and caffeine together. The combo is quite popular in the nootropics world and is reputed to help with focus when studying and suchlike. I've used that myself and my subjective feeling is that it does help at least a little.