Hello Alana,

You have not mentioned which country you want to do your PhD from, but if we talk broadly then to pursue PhD from abroad, basically you have to appear in the general test exams like GRE or the exam conducted to test your knowledge about the course you are willing to pursue.  With this you have to pass Language Proficiency Test like IELTS.

If you are thinking to do it from USA then GRE and IELTS will be your exams to decide your potential.

In New Zealand , only language test is required and rest your past records of graduation will be seen.

Similarly, for some other countries, other exams are the way of selection to their universities, which you have clear for admission.

I hope this answer helps you.

All the very best!