GPA is a representation of the academic success you achieved. While GRE can be retaken numerous times. Both GRE and GPA are heavily influential factors in your application to universities abroad.
Edmissions
What is an acceptable GRE score?
The required scores that universities consider acceptable differ depending on the program, the pool of applicants, and the other components like grades, LOR, etc.
When applying to universities abroad, both GPA & GRE scores will have a significant influence. Therefore, it is best to achieve a good academic record and marks in the GRE.