.I guess for medicine is not that difficult to enter cause doctors in Poland make less money than lawyers,economists etc.
there is no such a dependence. medicine is extremely difficult studies and it's quite difficult to enter...
Does anybody know about Polish Universities?
Generally, higher education in Poland is free, but most university departments require applicants to take an entry test. of course there is a limited number of students that will be admitted. these who won't can apply for the non-residential courses (but these are not free of charge)
There are also private universities/colleges where you only enrol and pay for tuition.
when it comes to grants, you can get scholarship if you have good grades. there are also social(?) grants for students who have low monthly income, but it's not much money.