M.Tech Eligibility

B.Tech percentage must be above 60. Do read my article on this issue 60% aggregate for M.Tech admission.
Must have a wonderful GATE Score or Good All India Rank, or Good percentile. Don't get confused and afraid with 99 + percentile. Percentage is different from percentile to read more about it refer to How to calculate GATE percentile.
Also refer to Top Marks in GATE 2010 to get an idea how many marks you need to go to IITs 800+ score may be reasonably take you to IITs.
Be prepared to take another test at IIT for admission. Learn the basics of each subject, especially core subjects related to your engineering stream, as there may be a written test for admission to M.Tech if the number of candidates has close scores. Written test decision totally depends on the Department offering M.Tech program in IITs.
Things are not ideal for most of the times most of the students score 60% above in their B.Tech, but the real challenge comes when GATE cracking the GATE exam. If you have little less score and a great passion to get into IITs and that only matters to you, then you should continue reading.

The eligibility criteria for MS differ in different universities. General eligibility criteria to study it in German University is as follows:
(a) High academics performance or records in undergraduate studies.
(b) If the course is taught in German, then proof of proficiency in the German Language. If the course is taught in English, then proof of proficiency in English by TOEFL or IELTS score.
(c) Some universities require GRE score
(d) With relevant work experience in the field of further study, chances of selection increases
(e) Demonstration of technical ability through project execution, participation in the technical symposium, conference, etc.
(f) Recommendations letters from internationally known faculty from where you have completed your graduation.