Excuse me, do I need to take IELTS to immigrate to the United States?

According to my guess, you immigrated with your parents, and you are the dependent of the main applicant. Immigrants don't need to take an English test.

In the United States, if you go to a public school, which school you go to depends entirely on your parents' address. Schools can't refuse you admission just because your English is poor, because primary and secondary education is the basic right of every child who legally lives in the United States. So, you can go to school without taking an English test. But if your language is not good, on the one hand, the school will help you improve your language ability, on the other hand, you may be required to attend ESL remedial classes (the expenses are paid by the government). General schools do not require you to take the TOEFL, but there will be teachers to evaluate your language ability. If you can't even meet the most basic requirements in language, you will have difficulties in some classes, which is not good for you. Therefore, I suggest that you should study English hard.

If you choose to attend a private school, the school can require you to have a TOEFL score. If the TOEFL score is not enough, you can skip school. However, most private schools do not recruit enough students and generally do not require TOEFL scores.