Definitely no. After we get used to solve those IQ, it's obvious our brain will solve them easier next time.
In order for an IQ test to be relevant, it's a must to be a brand new one for each individual...
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yes, we generally will get better at doing the same types of problems over and over
it's pretty hard to come up with a test that you can improve with repeat sittings
IQ test varies and time to complete the test is also a factor. There is a limit at which you will peak and you can take that as you "true" IQ. Someone with 85 IQ will never be able to answer the test like a IQ 140 would since at IQ 85, you can barely follow written instruction.