Preparing for the International Physics Olympiad (IPhO) using I.E. Irodov's problem book is a common approach, but opinions vary on its sufficiency. While some participants have successfully used Irodov, others suggest that its problem level may not fully align with IPhO standards. Many recommend exploring additional resources, particularly from the Art of Problem Solving community, where students share insights and strategies. It's noted that Irodov focuses heavily on problem-solving, which can be beneficial, but students may need to supplement their studies with more challenging materials to ensure comprehensive preparation for IPhO. Access to Russian problem books is also highlighted as a resource for further practice.