MTG IMO Class-8 Olympiad 10 Previous Years Papers (2023-2019 Set A & B) Mathematics with Mock Test Papers - Sample OMR Sheet with Chapterwise Analysis | SOF Olympiad Books For 2024-25 Exam Paperback – 28 March 2024

This is the best pyq book for IMO as it has all the practice questions and the weight age of chapters that will come in the exam

It has multiple papers and detailed solutions. Makes your brain ready for the challenge and also trains it for the next level questions. Doing the workbook alone isn't sufficient you have to give this a go.