The below references are planned for my descendants who are planning to start but faced issue how to start.
- All Questions of math olympiad and a list of online version sample questions
- Important book list shared by matholympiad org bd. Some important books are listed below.
- Learn with pavel youtube channel for learning and practicing and puzzle and riddles is a way of brainstorming
- Bangladesh olympiad practice youtube channel and most asked question about the preparation
- Practice on GonitZoggo to prepare yourself
- Art of problem solving is a nice reference to have a list of problems and solutions
- Asian Pacific Math Olympiad for Primary Students
- Math section of Khan Academy is really awesome to learn and practice different levels of maths
- Geeksforgeeks has a list of puzzle practicing section