Hii, Akshay 

The following are popular colleges providing diploma courses in German language:

Savitibai phule pune university

SRM university

Symbiosis institute of foreign language

ST. Stephens college

MIT school of foreign language

Eligibility- 10+2 from recognized university with minimum 55% in 10+2.Admission is completely merit based.

Fees-5000-30000( varies from college to college).

Scope:Translator,Embassy work,BPO,Content developer etc.

You can also join various classes like (excel academy,Goethe-institute,eurofluent etc) to lear german language and get certficates like A1-BEGINNERS,A2-where you learn to make sentences and small paragraphs,B1-where you learn to speak small sentences,B2.1 where you can understand german and will be able to talk german in day to day life. Further it goes like B2.2..where C2 is last.

For admissions you will have to either apply to the colleges or contact classes .

Hope your query is answered.

All thw best.