is it good to study archaeology in Poland?
It's not good to study it anywhere. It's usually near the top of useless majors worldwide. Better to study a STEM field like engineering or chemistry, and then branch out into archeology once you have some useful technical skills and knowledge that you can apply to the job. Otherwise, chance are much better that you will end you career advancement as a barista at Starbucks than landing one of the very few archeology jobs that open each year and draw several thousand applicants apiece.
Think of STEM as the balls of academics, and the humanities as crotch lice. Which would you rather have?