I am a fan of Erpkite as it helped me to learn about the sap from basic to intermediate level. I tried it for a month and I can see a lot of progress. I am doing good with certification and practice tests. There are a lot of sap preparation websites out there but Erpkite is the best. The practice tests are great for studying and valuable addition to the certification course. I was able to pass my test with a high score and get my certification because of it.