While I fully agree that GMAT does not test the 'intelligence' of an individual. There is no single absolute definition of 'intelligence'. At least for me 'intelligence' is the ability to appropriately act to certain circumstances for reaching objectives.
However, each individual will have different exposure, culture, environment, personality, experience, etc. Those values will sum up a person's characteristics, way of thinking and in short overall capability as a professional/student. With this in mind, I think standardized test is necessary to somehow 'gauge' the capability of that person.
GMAT is definitely not without, and actually has a lot of flaws. This is my personal opinion, but lets say a person came from a French Private Equity, the guy encounters numbers on a daily basis, however those numbers are definitely not GMAT maths and in terms of pure 'quantitative' terms it is less daunting then lets say engineering. Lets say this PE guy is an absolute beast in interpreting quantitative data, analysing the related qualitative aspects in the data and make a conclusion from those. From what I have experienced from the GMAT, the PE guy is most likely to succeed in IR section, but might have a hard time in relearning quant and ofc verbal, meanwhile the engineering guy will have easier time in learning the quant at least as he has a stronger 'fundamentals and framework' on quant. Despite the French guy is highly successful in his field and earns hundreds of thousand of bucks annually, I would not be surprised if after 3 months of study he will score lower than the engineering guy. Does this means the French guy is less intelligent than the engineering guy? Absolutely not.
However, just like an IQ test, GMAT test does have some correlation between someone's intelligence in terms of logical aspect and problem solving and one cannot fully dismiss the importance of such test, especially if such qualitative aspect as intelligence is very hard to measure.
This is just my personal opinion by any means, I hope it does not offend anyone reading this.
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