Well writing any exam for PhD abroad is totally depend on for which course you are going and also in which country you moving for. Normally Yes, there are usually exams required for doing a PhD abroad. The most common exams are the GRE (Graduate Record Examination) and the IELTS or TOEFL (English language proficiency tests). However, the specific exams required will vary depending on the country and course.
GRE
The GRE is a standardized test that assesses your verbal reasoning, quantitative reasoning, and analytical writing skills. It is required by most PhD programs in the United States and Canada.
IELTS or TOEFL
The IELTS (International English Language Testing System) and TOEFL (Test of English as a Foreign Language) are English language proficiency tests that are required by most PhD programs abroad. If English is not your first language, you will need to take one of these tests to demonstrate your English language skills.
It is important to note that the specific requirements for PhD programs abroad vary widely. Therefore, it is important to carefully research the requirements of the programs to which you are interested in applying.