Math2
Tablas Matematicas De David
Presented in Spanish, this site provides math tables and formulas from addition to calculus. Also links to a Spanish-English dictionary of mathematical terms.
Ministerio de Educacion, Cultura y Deporte (Spain)
Pagina De Educacion Matematica
In Spanish. A variety of multiple choice probability questions varying in difficulty. Also includes problems on statistics and trigonometry. a great preparation site for post secondary classes. Solutions are not provided.
Other
Estadistica
In Spanish. Overview of statistics and related concepts. Gives explanations, sample formulas and examples, as well as exercises for students to try (with link to solutions.)