Before You Start
Head to your target university website and check if German Language certificate is a mandatory requirement for your course.
Also note down the expected level of proficiency (A1, A2, B1 etc.).
Understand the overview of course levels and decide on your target level.
Step by Step Process
Step I: You would want to register for A1 level if you are a beginner, pick a higher level if you already have some German Language expertise. Also, based your convenience decide on whether you like to take online or classroom teaching course (recommended).
Step II: If you have opted for the online course, head over to online courses link mentioned below. Make sure that you have the technical requirements and then fill out the online application form. Send the completed form along with the DD to the address mentioned.
Step III: If you prefer classroom teaching, visit the Goethe website. Choose the Goethe Institut/Zentrum near you. You will be redirected to the respective website. The next steps are illustrated with Goethe Institute Bangalore.
Step IV: Check the available course schedule and the corresponding registration periods. You can also get the overview of all the available courses here. Pick the one that is most suitable for you.
Step V: The registration request is sent through the email. Make sure that the email format is right.
Step VI: You will receive the confirmation email and also the payment information via email.
Trivia
Goethe Institutes have extremely short registration window and the seats will be filled quite quickly (esp. for regular A1, A2 levels). So plan ahead and send the email as soon as registration period opens.
However, if you do not get a place in Goethe, you can still get the Goethe certification by appearing as an external candidate for exams. Check the exam registration details and fees details.
If you are directly registering for a higher level course (>A1), you need to take a placement test. You are exempted only if your previous course was taken at Goethe (within last 6 months).