Question

how could we become a scientist, which course should we take and how many years it would take​

Answer 1

Start out with the basics in college.

Declare a major in a field that intrigues you

Get an internship in college.

Hone your writing skills

Go to graduate school

Land a research internship just about anywhere

Participate in a post-doctoral program.

Keep your knowledge up-to-date.

Continue researching and seek out full-time employment

You should have at least four years of college. It would be better to get a Masters degree, which takes 2-3 more years of school after college.