Take a look at the math portion of the test prep material for the GMAT or other examinations. These materials include answers and solutions to questions. Ther

Take a look at the math portion of the test prep material for the GMAT or other examinations. These materials include answers and solutions to questions. There are also online communities explaining concepts to each other in more detail. GMAT covers number properties, fractions, decimals and percents, basic geometry, and algebra. It's a very good refresher.