Germany

Hi
Currently Germany is very welcoming for international students for the simple reason of their own aging population. The endeavour of make it in germany will clarify all your doubts about IT sector prospects as it is one of the much needed skill there. Check here.
http://www.make-it-in-germany.com/en/for-qualified-professionals/working/industry-profiles

Hi
Automobile designing is different from engineering and the degree courses in india for the same are very few. You will get all info related to it here:
http://ecampus.ltindia.com/Career_Guidance/Unconventional Courses/R-Unconventional Courses-Automobile Designing .htm
For germany and usa both, you need to score 80% above in 12th to pursue b.tech preferably. Check here
http://study.com/articles/Become_an_Automobile_Designer_Education_and_Career_Roadmap.html

Yes, Kishore, not just Germany, any good university in the world requires extensive working experience.
Regards

Dear Darshak, have you enquired if diplomas are accepted? The basic rule to study in Germany is by completing 13 years education, and undergraduate diploma are not accepted. What you may do is by taking the Studienkollege program in a German university, its an assessment program of one year, you must take a final test at the end of the program. On clearance you can apply to the universities. I will advice please visit daad and uni assist websites. You have already decided what to study so look for the colleges and requirements on these portals.
Regards

Hello Sourbh, you must clear 13 years education, hence must take the Studienkollege program. Please visit DAAD website for details or you can see UNI ASSIST portal too. Alternatively you may complete the first year of an UG program in India and later apply for the bachelor degree in Germany.
Regards

If it is US, you must take GRE as well if you want to target to top schools.

Hi Rakesh,
University of Stuttgart, TU Darmstadt, Munich University of Applied Science, FH Aachen, TU Braunswick and Bremen University of Applied Science are some of the best. You may refer to QS World Rankings for more options. Scholarships are quite competitive in Germany though all universities have financial aid. You must have excellent grades to be considered for scholarships.

Its not mandatory but you may require it to interact among your peer group and professors. While choosing your university, do check if they offer mba in english or not before applying.

No it's not necessary . you can go for this.
All the best.