Hi, My name is Wiktor and I got to the second round of the Polish Junior olympiad. The second rounds format is that you have 3 hours to solve 3 problems, each worth 100 points. To go to the 3rd round you have to get at least ~130 points. I solved all past problems, but I still want to train. There are also some other problems, but the system changed 4 years ago. The problems look like codeforces problems but I don't know if their the same. Anyways, do you have a certain site or some problems that can help me? PLZ reply fast.