It is really good that you have started to plan about your investment from such an early age. Please maintain the spirit throughout your working life, you will see the wonders because of the concept of 'compounding effect of investing'.
Let us come to the main part of the question. From the question, I am not clear whether you have any PPF Account, or not. If you have a PPF Account, you can put Rs. 1000/- every month before 5th in that account for risk-free, secure return with long-term perspective.. At the same time, I would also request you to start investing in an equity-oriented hybrid fund through SIP route with gradual increase of your income and saving. The best funds in this categories can be easily obtained from various mutual fund websites like www.valueresearchonline.com or www.morningstar.in.
Caution: Explosive. Handle with care.