The average IQ of China people can reach 15, and that of Indians can reach 82. This is just some information found on the Internet, and the so-called IQ test really contains a lot of water, because it can't completely reflect a person's real IQ, and his learning experience and personal way of thinking have certain connections.
The real thing that can measure IQ can reflect the thinking speed and thinking structure without people mastering any knowledge, instead of some exercises like phonetics, brain teasers and the same ones that appear on the Internet. These exercises can be solved as long as you have enough mathematical experience, you have studied advanced mathematics, modern probability theory and higher-level professional mathematics. It is not a special thing.
At present, most IQ test papers circulating on the Internet are similar to observing and finding rules to judge how a person's way of thinking is. He can't judge the reaction speed of thinking, because time may be sufficient, and he can't judge the structure of thinking, because if a person's knowledge reserve is large enough, he can find out the rules and solve them, so when he was in primary school, he did a set of IQ test questions. After he graduated from college, he did the same set of questions, and the results were completely different. If he went to a master's degree or even a doctor's degree in mathematics, the results were also different, so this could not reflect people's true IQ.
Some living habits in India are indeed unscientific and not hygienic enough, but it doesn't mean that people have IQ problems. Don't be influenced by some false information on the Internet. Really, we can't judge which institution this data comes from, and we don't know whether it is authoritative and scientific enough.