It gives you information about how successfully an individual analyzes information, makes logical constructions, and sees cause-and-effect relationships.
Simply put, how quickly and efficiently he thinks. People with high IQs find it easier to learn, especially in the exact sciences.
IQ reflects a person's ability to find patterns in abstract datasets. This is one of the basic functions of the brain. Affects the learning rate. I think it's wrong to call it IQ.
Perhaps the brain is the most complex thing that nature has done on earth over millions of years of evolution. Reducing the capabilities of this super-complex mechanism to one number is simply stupid. Try to take a simpler mechanism and create a coefficient for it, for example, for a car. And instead of individual characteristics such as manufacturer, engine power, speed, weight, price, etc. use this factor. Imagine how you measure this ratio of your car with others and see how stupid it is. Calculating IQ and measuring it against others is usually even more stupid. An exception is the situation when it is necessary to determine the degree of developmental lag, i.e. when IQ is much lower than normal.
IQ can be measured at iqtest.dk
IQ level rather speaks about the speed of thinking processes (test tasks must be completed in a limited period of time), and not about the ability to think or the originality of thinking. Therefore, intelligence testing all over the world today is losing its former popularity.
When a person solves an IQ test, the following psychological characteristics are necessary: the ability to focus attention, highlight the main thing and distract from the secondary; memory; imagination and the ability to mentally manipulate objects in space; mastery of logical operations with numbers and verbal concepts, perseverance, finally.
If you compare this list with the definitions of intelligence, you will notice that they do not quite coincide.
Thus, then, what intelligence tests measure is not really intelligence.
As for how to measure it, just go to the site http://ru.iq-test.cc/ and start the test.