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.
I know you know this, but how do you know? I believe it to be entirely possible to get a 273 score by taking the 2-5 test. DS's score placed him at the 92nd percentile for 11th graders as well as 92nd percentile for those who had finished Algebra 1. He also told me that the questions got past his knowledge level and he had the feeling he had missed some at the end, same as the other times he took the test.
