phynessa33 wrote:does anyone know which units of measurements are covered in the GMAT test?
The GMAT will assume that you know units that are globally standard:
TIME: seconds --> minutes --> hours --> days --> months. (e.g. a problem that states "in each month last year" will expect you to know that there are 12 months).
MONEY: 100 cents --> dollar. Ok, US currency isn't really a global standard, but they assume everyone knows this. They won't ask about fractions of other currency.
For other measurements, the GMAT will NOT require you to know any non-metric systems. You will see problems written in Imperial measurements (miles, inches, degrees Fahrenheit, etc), but if you're being asked to convert from one to the other, the GMAT will give you the formula for conversion, as Rich mentioned. They'll likely even give you the conversions for metric: grams to kilograms, etc.
Besides knowing your metric system prefixes, I wouldn't bother memorizing any unit conversions.