Feel free to PM me and I will try to answer all your questions, I'm Pole myself and commencing studies in Scotland (Uni of Aberdeen) this year. They're actually quite lenient when it comes to requirements. My condition was to score 75% from advanced Maths (along with overall 75%, 75% from advanced IT and 70% from advanced English but I fulfilled them) and I got in with 56% . My guess is that with introduction of percentiles in Polish matura they are looking more at them rather than the score itself (because my percentile from maths was 75%).
What Uni are you interested in?