Information Regarding PhD Admissions
The GRE is generally not used at all in Europe for Master/PhD admissions.

Another thing is TOEFL, if you will be studying in English you usually have to prove that you are proficient with the language, and there are multiple ways to do it. You have to check with particular institutions to what they require, it could be the TOEFL or IELTS or any other test of english, or proof that you have already completed a degree in English, etc.