There are various start-up firms that are doing well in the field of data science. There are MNCs that have renowned analytic divisions. But to answer your question, some of the best companies in terms of data science utilization and analytic muscle with a presence in India are:
Mckinsey
Mu sigma
Wipro
Accenture
TCS
HCL
Cognizant
Genpact
The above-listed companies are in no particular order. They are companies that have a solid reputation for leveraging analytics and data sciences for the betterment of their own organization as well as for the provision of solutions and insights to clients. If you want a detail explanation of Data Science then do check out Intellipaat’s blog which will help you in understanding DS.
You can get a hands-on project by referring the following Data Science Courses by Intellipaat which will teach you Data Science from scratch.
And if you are more into videos then do check out the following video tutorial which will help you in mastering in the field of Data Science: