Unfortunately this exam was developed in house by Efficio consultants, and therefore we do not have an example of questions to provide. To the best of our knowledge, we are the only management consultancy using an exam of this type.
However, if you are comfortable crunching data on Excel, and using the main functions (i.e. vlookups, pivot tables, sumif, etc) you should be able to successfully complete the exam.
The best way to prepare is through general Excel use and practice, using large data sets.