Is a person's IQ fixed by nature? Is there any way to improve IQ the day after tomorrow?

It is not fixed. It can be improved the day after tomorrow, mainly through interpersonal relationships. IQ is a person's ability, such as the ability to observe, analyze and solve problems. A person's IQ is related to his (her) talent and his (her) learning the day after tomorrow. It should be said that it has more to do with learning the day after tomorrow. Good study, rich knowledge, and personality quality can be said to be part of IQ. And some knowledge should be learned through interpersonal relationships, so as to see interpersonal relationships more widely.