Germany

Hi Pooja, GRE is not required for admissions in any German university. However, good GRE scores can increase your admission chances. If you are planning to take the GRE a score above 310 would be good.

dear Karthik.
suggesting College is Just not enough. I would ask you to make search on Google about college of Germany and have detail information about college,faculty,fee, and all others. best wishes.

Hi
You can explore their official website daad.de for all requirements and other useful information. For master's you require a good cgpa in Bachelor's, work experience and lots along with some publications/ research papers.

Hi
There are no books available in today's fast changing world of information so you may check the official websites like daad.de for germany and decide. Here is some information that might be helpful to you.
http://www.canadian-universities.net/Universities/Programs/Graduate-Studies-Medicine.html

You are requested to confirm your branch and interest areas for appropriate advice.

Below is a selection of the available study options in Germany
University of Freiburg
Technical University of MUNICH
University of ULM
Bielefield University
TU Dortmund University

Hard to say, education standards are so high in Germany and so is the academic qualification and an applicant's mettle. A diploma will land you nowhere. If Germany is the country you are heading for holding a Masters or a even BS from a reputed university is important. Also the country offers no diploma programs on the whole. However check RWTH Aachen-RWTH International Academy for a short term course in automobile engineering they offer. The program is meant for current undergraduate students who have a strong command of the English language and are interested in automotive engineering.
Regards