Diploma

Hi Sushant,
Diplomas are not accepted by German universities. You can pursue your degree but after satisfying the admission requirements. Please enroll into a Bachelor degree program in a recognized institute and complete the first year with very good grades. Check the ANABIN website for your degree equivalency. Since most UG programmes are taught in German, knowing German language is mandatory for many universities. Take your IELTS too. Also check the DAAD website:
http://www.daaddelhi.org/en/

Your Diploma in hardware and networking has nothing to do with your MBA, neither it makes you ineligible nor it adds any weightage for admission. If you have minimum 50% in your graduation you are eligible to apply for MBA program subject to qualifying entrance exam and satisfying other criteria prescribed.

You can pursue MBA.