@Sanskar singh Whenever you will half question, there will be likely to be different replies. You are talking about your capital gains income only. Whether you are a salaried person or a business person. It is always better to ask your tax consultant, if you are filling your ITR through him. If not than it is better to file your ITR through any tax consultant because you have 3 lakhs + STCG.
@Chhote Lal If a person is investing in share market, there is no question that he has no other income. He will definitely be having other income, either from salary, pension, interest or business.
As far as I know any income for a salaried/Pensioner person upto 7.5 lakhs (7 lakhs +50 thousand as Standard Deduction) is tax free in new regime. I am not a tax expert, neither CA by profession, but a Govt. Pensioner.
It is always better to contact tax consultant to avert any IT problem. Spend some fund and sleep well. Even @Chhote Lal has suggested good option, if you want to save consultant's fee. Don't mind my views.
Wish you to earn more profits from IPO.