How to save on income tax (fresher)

Hi, I'm a fresher (software professional) working for an IT company in bangalore. I started working since mid July and continue to work in the same company at the same salary. Now the company has asked me to provide investment proofs so that accordingly my tax saving and calculation can be performed. Since I'm a freshers and this is my first job, I have no clue on how to save on taxes. I'm providing you the details of my pay slip. Can tell me the exact tax which I'm eligible for deduction and how to save on this tax? Below is the annual income according to 9 months as calculated by my employer Basic - - 131718 Conveyance--13523 HRA - - 65863 Special allowance--56592 Meal allowance - - 5500 Stat bonus - - 15399 Meal adjustment - - 497 Bonus - - 20287 LTA--26344 NET TAXABLE INCOME-- 335723 Less deduction u/s 10--19023 Less professional tax recovered by current employer---1800 GROSS TAXABLE INCOME--314900 Less deduction under section 80CCE--15806 Income chargeable to tax(rounded off) - - 299100 -----------------x-x---------------- I pay a rent of 17,000 per month. What should I do for HRA?.. How much more tax can I save and how?.. What is the least possible I can put in PPF or NSC such that I save tax and not more money is locked in for 15 years (ppf)?