Putnam preparation

The best preparation for the Putnam competition is going over the problems from previous years. Problems (with solutions) can be found on Kiran Kedlaya's archive.

There are also three published books, containing all past problems up to 2000. In the books the problems are discussed in detail, and sometimes given multiple solutions: Other recommended books are: In addition, various universitites maintain web sites with more resources for Putnam preparation, including practice problems. See for example the sites at Stanford, Northwestern, and Wesleyan.