Hi guys, so this is my first post regarding the physics Olympiad in preparation for OSN-P 2022 with afaslearn as our institutional platform, I and my friend, Fahmi Fadhilah Almas, are tutors at the institute, this question covers material mechanics, oscillations, fluids , and gravity as our prediction for facing OSN-P 2022. I hope that from this solution you can learn something new and better! Here's a link of the solution. Thank You.