1) "Geometry" by Serge Lang. This is essentially a high school geometry book done right. It doesn't bother with two column proofs and other silly things. It treats geometry like it should be treated.
2) "Introduction to Geometry" by Coxeter. Maybe use this as a second book. It's very rich and offers an introduction to many different fields of geometry. It's not an actual textbook though, but more an introduction. Not suitable as first book.
3) "Elements" by Euclid. The very first geometry book and a standard for over 1000's of years. It is a recommended read to everybody: it develops geometry from scratch. However, you must be aware that there are some errors and omissions (for example coordinate geometry).
Thank you. I was also interested in taking my schools math contest next semester. I will be starting second semeste calculus. Do you know any good books that can prepare me for the types of questions math contests have?