Hello.
The procedure of having certificate from Google is same as you do in NPTEL, you can do different courses from Coursera and after you can have certificate by Google, here you will be given recorded lectures by top most universities and colleges for different courses you will have to watch these lectures and then you will also  have to fill assignments which will be given on the basis of time interval, and finally you will have to give exam which will judge you for certificate.
you can have more details by going on the official website of Coursera which is given below:
https://www.coursera.org/courses
Best of luck.