Wiekszosc mass nouns np. experience, education moze byc countable lub uncountable w zaleznosci od tego co chcesz wyrazic/jak je sklasyfikujesz.
np.
We are looking for someone with accounting experience. (acc experience in general)
It was a great experience travelling around the world. (specific experience)
I have good education, but no one wants to hire me.
I received a good education at Public School No. 15.