That's roughly 1,500 zloty a month.If you have no mortgage or rent and just have to pay for food and basic needs it's a livable amount.
1,500 PLN a month on top of fixed expenses like rent, untilities, and school costs would enable you to lead a very frugal, monastic existence. You might satisfy your basic needs, but not very much beyond that.
IF you don't drink, don't smoke and are young, single-and-not-looking, in excellent health and exceedingly self-disciplined, yes, you can do it. But it's going to be tiring and frustrating.
Eating out in a mid-range restaurant is going to be a special event. Same with going to the movies, or buying a book. God forbid if you have to go to the dentist or doctor, especially if it means losing time at work or having to buy expensive medications. Saving up money will be impossible, and you'll be living without a rainy-day fund. Travelling is out, as even a cheap day jaunt to a nearby city will be a major item on your limited budget. Buying clothes is going to require a lot of restraint. Food is going to be very basic, and you'll have to be a wise and frugal shopper.
Sure, it can be done, and lots of people do it. Doesn't mean it's going to be fun, though, because you'll be constantly worried that unexpected expenses will arise.