Hi Aspirant

A few things i would like to tell you that google company doesn't hire everyone and anyone.

Google is nowadays involved in new technologies like Artificial intelligence ,machine learning ,deep learning ..etc.

If you really want to work at google then the stairs would be an IIT .If you are in IIT you will get a chance to sit in the placement of the google and then it becomes very easy to get into it.Also you can get a chance to do summer/winter internship at google.

IITs provie you the environment and nurture you in that way so that you can get into google.

After you are in Btech then you can do the courses like AI,python,Machine learning ,deep learning .Then these courses will behelpful.

Hope this helps you.