Question

HEY FRIENDS
Please suggest a nice book for regional mathematical Olympiad (RMO)
Other than Challenge And Thrill of Pre-College Mathematics

Answer 1

i think you should prefer these books
Problem Primer for the Olympiad
An Excursion in Mathematics

Answer 2

Answer:

Hall and knight (writer name) by arhinat is also a good one. You can search it on Google and you would also find it on Amazon. I have this book and is really helpful

Previous year paper by HBCSE. If you would visit hbcse official site and navigate through some links you would find the page to buy previous year paper of IMO. I, myself hadn't used it but have seen many positive feedback of this book on net. So you could give it a try.