While it could be argued that all students would excel if they were given more time, the bigger issue is HOW the time is spent. In the case of an ADHD student, time is relative. An hour of solid work for this type of student could be double that for a student unaffected by this limitation. In most cases extended time is access, not success, because the student is being given the same relative amount of time to complete the assessment as other students. Also the amount of preparation for each student needs to be taken into account. Students are all given the same amount of time to prepare for the test, which if the student has a learning disability they would need to study even harder in the time leading up to the test to ensure that he/she retains the information necessary. It is reasonable to assume then that even though they are given extra time to take the test, they may be at a disadvantage when it comes to being prepared.