I have a couple of friends who have taken the sap certification practice test, and they all said it was very helpful and worth the money. So, I decided to go for erpkite demo test. I am really happy with erpkite so far. It was a little difficult to get through it the first time, but I realised how much more I actually understood about SAP once I did. The questions were also very helpful in explaining concepts, and there are plenty of quizzes to help you retain information as well.