The Singapore and Asian Schools Math Olympiad (SASMO) practice papers are structured to build mathematical intuition and higher-order thinking rather than testing advanced academic topics.
Take one past year paper without any help. See where your natural baseline is.
with worksheets, quizzes, and timed tests for various grades. Sample Practice Questions
A student who does 30 papers but never analyzes mistakes will plateau. Quality > quantity. Do 5 papers deeply rather than 20 shallowly.