Hello Aspirant,


A data scientist is anyone who analys and interprets data to strengthen or align with a company's overall goals.

Essential things to do for becoming a data scientist are

• work on your mathematical skills
• programmatic skills
• learn SQL
• study machine learning (in any language, most commonly used language in ML nowadays is python)
• get some work experience as a data analyst
• sharpen your skills with an online course or bootcamp.

For relevant master's degree, you can go for Mathematics, Astrophysics, statistics or any other related field. But Data Science is a very different domain, no single degree can cover all the disciplines of the subject.
For more relevant information about a Data Scientist, have a look at this link once:
http://www.careers360.com/careers/data-scientist


Hope this helps

All the best!