Getting students ready for college-level chemistry courses is no easy task. Fortunately, Washington University teamed up with the Howard Hughes Medical Institute to create this online tutorial for persons seeking to do just that. The tutorials here offer reviews of introductory topics within the field of general chemistry, practice problems, practice quizzes, and an online diagnostic exam. On the left-hand side of the site, visitors can click through sections that include "Periodic Table" and "Constants/Equations". The "Subjects" area includes twelve different topics, including moles, chemical formulas, and stoichiometry. Each topical area has a brief overview, complete with diagrams and other illustrative materials. Also, the diagnostic exam may be quite helpful for educators and students who wish to test their mettle against the basic principles of such a chemistry course.