Turn it into a party game. I have a group chat where we share the hardest "Thermodynamics" problem of the week. First one to solve it gets out of buying the next round of drinks. It turns a bar night into intellectual fencing.
: Many Russian problems are adapted for the international stage. Sites like IPhO Online offer similar high-level problems with full solutions. International Science Physics Olympiad (ISPHO)
Recent 2023-2024 and 2021 finals featured high-level concepts that are perfect for practice:
Stages include both a theoretical contest (often 5 problems in 5 hours) and an experimental contest with hands-on assignments. Top Sources for Russian Physics Olympiad PDFs
When you finally track down a repository of these problems, you will notice a few recurring themes that make them "hot" (i.e., high priority) study material: