Should I prepare for GRE if I want to apply for Australian and European universities which don't require GRE?

[ShirinChay]

I want to my MS in Data Science. I have quite low GPA. But since people on r/gradadmissions said GRE does have completely filtering role and will not matter at all if any university don't require it. So I want to ask, would it compensate my low CGPA somehow? Or should I not focus on GRE at all if it is not required?