The E1 test is one of the most popular IT-based tests in the world. It is the flagship exam of the Organization for Economic Cooperation and Development (OECD). The test is held every two years. I suggest you to get essaygeeks.co.uk review and info that students who are search writing tips. The test is generally considered to be a "black belt" exam, as far as questions are concerned, with the exception of the C-Level Portfolio exam, which is regarded as a "white belt" exam.