Lucounu-
That is true to a certain extent- the main difference is the starting point. However, the 2-5 test has a discontinuation criteria at the end of Algebra I topics and the question bank does not contain all the topics that are on the 6+ test. There is a lot of misunderstanding about the tests and the variations because in most cases, NWEA requires you to pay for a higher level training to get the real nitty-gritty info. Most schools cannot afford that. If you're really curious, ask your teacher for the Descartes Report with the individual subtest scores, as well as the Descartes Goals that include the "skills and concepts to introduce." You should get one for each subtest, of each test given (usually Reading, Language Usage and Math, though some give Science as well)