You can take some subject to learn about stocks or investing like you can take economics to learn some basic of finance and then you can take micro and macro economics to learn about stocks and you can also join any institute to learn about stocks, there are lot of institute where you can learn about stocks.Some institute you can choose to learn about stock are
National stock exchange they provide short term courses
NIFTY trading academy
Radical Institute of stock market,
Maheswari institute,
Arihant capital market,
Kalpataru Institute of capital market.
(Source: https://www.quora.com/What-class-can-I-take-in-college-to-learn-about-stocks-or-investing)
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