What are some really good stocks to invest in?

I am an 18 year old looking to take my auxiliary savings and invest it into stocks. I currently have $1500 and I am hoping to double or even triple my money as soon as possible. I have spent many hours of research on the stock market and stocks themselves and I am expanding my inquiry to actual people rather than books and various other forms of education on the subject. Currently my plan is to take 20% or $300 of that and Invest into high risk, 30% or $450 and invest into medium risk, and 50% or $750 in low risk low income. Thanks for your help!