Can anybody please tell me what is the easiest way to have.(without any exam).
According to news reports (and seemingly legit, from what a contact has told me) - you can get a Ukranian driving licence for 2000USD and then exchange it for a Polish one, without ever sitting any exams.
Otherwise, forget it - if you can't afford to get your hands on a foreign licence, then you can't buy one in Poland.
If you can't pass the (easy) Polish driving test, then you really can't know how to drive ;)