Sorry Terri, but that's not true.
There are plenty of free adult high schools available - for instance progresjeden.pl/poznan/oferta-edukacyjna/liceum-dla-doroslych.html -
Nasze Liceum oferuje naukę bez opłat.No need for excellent Matura exams. There are plenty of subjects offering entry for those with very low grades, even at the best universities and in good faculties, such as the law faculty at Adam Mickewicz University in Poznań.
May I ask the age range for the free adult high school, if you do just one year or how it works, and also the age range? Is it difficult?
Age can vary wildly, it's not uncommon for women to do it later in life, though it's mostly people in their 20's that have realised that they need it. Usually they last for 3 years, but you can probably skip some of it if you have proof of finishing a certain year in Australia. It's not difficult, but the reading might overwhelm you. But bear in mind that this is aimed at getting people educated at a basic level, so it really won't be that tough :)