Aptitude vs intelligence test?

IQ is broader. An IQ test is a broad measure of knowledge is many areas, whereas aptitude is the ability in a more focused area. A standard IQ test, the weschler IQ measures the average IQ at 100 with a standard deviation of 15. This means than an IQ below 70 falls into the range of mental retardation and an IQ above 130 is in the "superior" range. An aptitude test measures things like an aptitude to build.