About 10 years ago, someone asked me how good I was with pivot tables in Excel. Having learn't Excel (self taught), and also knowing old Lotus 123 and Quatro, I though I knew everything about spreadsheets. Was I wrong. Pivot tables are pretty powerful tools and there is so much in them software! Failing a specific test does not mean you don't know Excel well enough to do some very useful things, so don't feel bad about it. Just learn from the experience.