See if you want to make a good career in Stock Market then as per the experts and the information available online the best courses/subject will be Finance (Business Studies can be good). Now a days there are lot of online courses available which are for training candidates in the field of stock market. So its not required that for Stock market you need to do graduation in it only but if you wish to go for stock then I would say any course in Finance will be better choice for you.

To know more about Stock market visit the link below:

https://www.careers360.com/courses-certifications/institute-of-financial-market-courses-stock-market-course-for-beginners-course

I hope this answer helps. All the very best for your future endeavors!