basic idea of application process

1. For University short-listing (Any Branch) : https://www.daad.de/deutschland/studienangebote/international-programs/de/?p=l#q=&degree[]=2&fos[]=4&subject=710&lang[]=2&langDistribution=6&tyi[]=1&tyi[]=2&dur[]=8&dur[]=9&dur[]=10&dur[]=11&dur[]=12&dur[]=13&dur[]=14&dur[]=15&bgn[]=SW&sortBy=1&page=1&display=list

Every deatil about the course is mentioned over there (Includes: eligibility, fees, application deadlines, course website, documents required, how to apply and so on)

2. IELTS/TOEFL is a MUST for Germany (anything above 6 band is enough)...

3. GRE - depends on your course (refer course website) - but GRE has an edge over other normal applications - improves your rank (no matter what mark you get)

4. German language certificate is valid only from Goethe Institute - (Basic requirement for VISA- A1 must be completed and should be learning A2 at the time of VI)

5. Uni-assist process - 1st univ charges 68euros and 15 euros for each univ after the first which means 68+15+15 euros for three universities applying through uni-assist!
Payment can be done through credit card or Thomas Cook, UAE exchange (special charges include) and the like! (No debit card payment)

Link : http://www.uni-assist.de/service-portal.html

6. University ranking: http://ranking.zeit.de/che2013/en/

https://www.daad.de/deutschland/studienangebote/ranking/en/ @k7