There are some book that have helped me with problems and theory.
Geometry
-Shuyriguin
-Challenging problems in geometry (Posamentier,Salkind-Dover)
-Mathematical Circles (Dmitri Fomin, Sergey Genkin & Ilia Itellberg )
Combinatorics
-Problem-solving estrategies (Arthur Engel)
-How to count without counting (Ivan Niven)
Number theory
-Introduction to number theory (Ivan Niven)
-Elementary number theory with applications (Thomas Koshy)
General
-The art and craft of problem-solving
-Selected problems of the Vietnamese Mathematical Olympiad
-Problem solving through problems
-How to solve it (george Pólya)
Easy Math Editor
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Thanks for sharing the info!