Hi Rushabh, welcome to Indiawilds.
There are a lot of people in India who have progressed in the field of wildlife biology as their full-time work, without initial formal education in this field. Some have taken formal courses in the same at a relatively late stage of their lives (of course, it is never too late!) A lot of people think of wildlife biology as similar to more popular activities like wildlife photography, birdwatching etc., while in reality the difference is huge. If you're interested in it, you certainly can pursue it. Most interested folks (including some promising people I know) are ultimately put off by the relatively low income, and the sometimes precarious nature of a job in this field. One may not be able to afford luxuries working in this field, but if you have a passion for it, you'll find yourself being drawn to it.