There's no way I can think of, I don't even think illegal drugs are profitable enough for that time spam. Your so limited by you age, almost any sort of investment would require the help of someone 0ver 18 like a parent.
Some investment funds earn 10% a year, meaning you could earn an extra $60 from your investment by June.
You don't legally. You are talking multiplying your money by 20 times - just not doable unless you undertake some illegal activity (drug dealing comes to mind). Even a job won't help - at 15, you are looking at a minimum wage job plus school, but even looking at a $10/hour job, you probably won't work more than 1,000 hours (full time) over the next 6 months whicg comes out to $10,000 before taxes.
These aren't negative thoughts, just reality.
invest in companys. spend it on buying old computers fixing them and selling them at a proffit
no way to do that without a tremendous amount of risk that might cause you to lose all your investment