**General Problem Solving:**

**Basic:**

Holton, D. (2009). *A first step to mathematical olympiad*. (First ed., Vol. 1, p. 297). World Scientific.

Rusczyk, R., & Lehoczky, S. (2006). *The Art of Problem Solving, Volume 1: The Basics*. (7th ed., Vol. 1, p. 288). AoPS Incorporated.

**Advanced:**

Engel, A. (1999). *Problem-solving strategies*. (Corrected ed., p. 416). Springer.

Andreescu, T., & Gelca, R. (2009). *Mathematical olympiad challenges*. (2nd ed. ed., p. 300). Birkhäuser Boston.

Andreescu, T.(2011). *Mathematical Olympiad Treasures*. (2nd ed. ed., p. 261). Birkhäuser Boston.

**Algebra:**

Andreescu, T., Feng, Z. (2001).* 101 Problems in Algebra From the Training of USA IMO Team.* AMT Publishing.

Pham, K. H. (2006). *Secrets in Inequalities.* (1st ed., Vol. 1, p. 251). GIL Publishing House.

**Combinatorics**

Chua C. C., Koh K. M. (1992) *Principles and Techniques in Combinatorics.* World Scientific.

Andreescu, T., Feng, Z. (2003) *102 Combinatorial Problems from the training of USA IMO team* (1st ed., p. 115) Birkhäuser.

**Geometry**

Andreescu, T., Feng, Z. (2005) *103 Trigonometric Problems: from the training of USA IMO team. *(1st ed, p.214) Birkhäuser.

**Number Theory**

Andreescu, T., Andrica, D., Feng, Z. (2007) *104 Number Theory Problems: from the training of USA IMO team *(1st ed. p. 204) Springer.

**Useful Links**

Art of Problem Solving: First stop for finding contest problems and discussing Olympiad problems on the forum. The Alcumus program on the website is also extremely useful for beginners.

The IMO Compendium: Collection of IMO problems as well as Math Olympiad articles specific to topics in Math Olympiad.

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Shijie, I’ve some really nice e-books in pdf format, maybe I could post the link the other day.

Nice 🙂 What books do u hv?