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search all of these on annas-archive.org , it won't allow me to upload pdfs since it thinks I'm a bot:
Mathematical Circles: Russian Experience (Mathematical World, Vol. 7) by Dmitri Formin
Elementary Number Theory by David Burton
Challenge and Thrill of Pre-College Mathematics by Venkatachala
Problem primer for the olympiad by Venkatachala
Euclidean Geometry in Mathematical Olympiads by Evan Chen
Modern olympiad number theory by
Aditya Khurmi
Any book by Titu Andreescu, especially his 104 problems series