IELTS is an accepted test in almost all universities in the USA. However, most universities do not ask for it if you are proven to have sufficient knowledge of English.
Not all universities ask for TOEFL. However, most PhD aspirants will have to attempt one. It all depends on the university and its demands.
The American College Test (ACT) is a multiple-choice test that evaluates your critical thinking capabilities. A minimum score of 22 will be required to clear it.
A PTE is a computer-based test accepted worldwide. Most English-speaking countries ask for it. However, you may not need all these tests attempted.
Graduate Record Examination (GRE) is mandatory if you apply for Engineering and Master’s in the USA. A few business schools have also started accepting this score for MBA.
The Scholastic Aptitude Test (SAT) is accepted by a few universities like Harvard University. It is again a multiple-choice test.
Graduate Management Admission Test (GMAT) is required if you want to pursue your MBA in the USA. A minimum score of 700 would be needed to pass the test.