i wanted information regarding the TOEFL/IELTS..The different categories? what advantage u posses if u have already prepared for GRE?

there is some advantage.you have already prepared yourself for the vocabulary and comprehension sections and there are similar questions there also

Hi, As the medium of education of universities in US, and all the ,masters level program offered to international students by German universities is English, so all the international students whose first or native language is not English have to take either TOEFL or IELTS test to prove their englis

These are two separate exams and both are required that is GRE and TOEFL/IELTS for admission in PG at USA, UK, etc. Since answer to your question woul;d be very long, I suggest you visit www.greguide.com and www.toefl.org to get the complete idea.