Diploma

Hello,
Study abroad typically is a very generic term. Procedures vary with every country and university. Again, every program has different admission requirements. In general, you must have sufficient academic scores or percentile and must take the IELTS or TOEFL to study abroad, also you have to me

Hello,
Yes, rightly said by Dennis V, you must take your IELTS and also German language certification. However, I doubt if Indian Diplomas are accepted. Generally, Diplomas are not accepted and you have to complete the first year of a Bachelor's degree in India before applying to a German university

Hello,
Yes, they do. You can be eligible for a Bachelor's degree, however, you need to have sufficient percentiles and must take the IELTS or TOEFL.

Swaraj, you can take admission in B.Tech Lateral entry. The eligibility is
Pass with 60% aggregate marks in Diploma (engineering.) (any stream) (3 years after 10th) or B.Sc.(Non-Medical) or B.Sc.(Computer Science) or equivalent, subject to qualifying LPUNEST-2017.
Or
In case marks scored in Diploma (

Yes, you are eligible. But, for studying in any of these countries, you need to fulfill English proficiency criteria of the specific college.
As per estimate, if you take IELTS test, you need to get above 6.5 band overall, and then only you can apply for desired country.

There are many Institute in India for Diploma in mechanical engineering, but you tell me your preference of college location rank that you obtained in entrance exam.