IQ tests are designed in this way, they just show your selected skills comparing to majority, in other words how "normal" you are. Their results always vary on daily basis, in terms of usefulness they are like measuring mean value of temperature during the year, not much useful information for individual cases. Also they are badly designed quite often (like what's the 4th number in sequence: 1, 2, 4, ? it can be 8 2^0, 2^1, 2^2, 2^3, but it can be 7 like in: 1, 1+1, 2+2, 4+3, 7+4, 11+5 etc. so you must read author's mind to answer correctly, it's possible by accident or if you're not that smart to know any alternative answers). So if you have high IQ it means you're good at resolving IQ tests, nothing more, and they are mostly just for fun.
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