PF and Gratuity are the benefits of your past service and are not accounted in taxable income. So while filling your Income Tax return you can show them under the head of non-taxable receipts during the relevant financial year.
Now coming to your query whether you have to file the return or not. It depends on your earnings from various sources in that financial year. Presently, if your income is less than Rs 250000 per annum, you are below the limit of taxable income and in that case, you need not to even file the return.
In this reference, the most important thing is that in subsequent years your income may increase due to your joining a good job and you will cross this threshold of Rs 250000 and will be liable to file the return. In that case, when you file a return, the tax authorities may insist you to file the return for last one or two years. So to avoid this problem, even if you are below the threshold limit there is no harm in filing a return.
Let us take a practical example now. Suppose you have invested in bank FDs and you are getting some interest then it is taxable. Another thing is if you have some property and you are getting rent from it then it is taxable. Further, if you had some shares or bonds or Mutual Fund units which you sold in 2017-18 then some of those gains are taxable. All these interests or capital gains are taxed in different ways and most of the places some basic exemption will be there. For example you can deduct 30% of your rent received before you add it to your taxable income.
Now if you add all these (of course if you have these sources!) and you find that your taxable income is above the threshold, please file a return. It will help you in long run.
Please also note that if you have some income which you want to hide then there is no point in filing a return because due to linking of bank accounts etc you will be caught sooner or later and will be asked to file revised return along with penalties. So check and see all your sources of income and consult a Income Tax consultant and file a return.
Some people who are very near to threshold do not bother to file a return. There is no problem but they should invariably maintain a detailed record of their earnings and savings and calculate themselves the steps of Income Tax and when they find that they need not to pay tax then just keep that worksheet with them for any query or notice from the tax department.
Knowledge is power.