You can’t use Excel. All that is available is a Windows-style calculator, which is all you need. The exam’s focus is not so much on detailed computation, more about concepts. For example, you won’t be asked to compute skewness of a distribution but you might be asked about what inferences you can draw about skewness if the median is less than the mean. Riskprep has lots of useful questions that test your understanding of concepts, without having to perform lengthy calculations.
Jim