I have read through the different responses to your question, and they are all excellent, so I will not repeat their good advice. As a former elem. school teacher who had to administer TAKS, I know what it can do to a child who has ADHD. ( I, too, share that diagnosis...) Let me assure you that the teachers never WANT to fail a child for just not passing a TAKS test--there is a complicated formula that is used to decide if the classwork and the TAKS score indicate that the child should be held back. You didn't say what grade your child was in, nor which TAKS he did not pass. Some hold more weight than others, esp, the Reading TAKS. Is your child helped by medication? I watched helplessly as children who most likely needed medication in order to be successful were denied it by their parents.(That really played havoc with their CoGat tests, which are timed.) If your child's ADHD causes a learning disability that has been diagnosed, then there is help within the Spec. Ed. umbrella. However, if your child does not require assistance within the regular curriculum, and his skills are on level, then I do not know if he qualifies for anything 'out of the ordinary.' I believe that any accomodations must already be in place prior to TAKS day. The teachers have a legal deadline that they must follow for accomodations to be allowed.
I will tell you what helped a couple of my kids, who had short attention spans: my principal was not one who 'watched the clock' on TAKS day, and I was allowed to give fairly frequent breaks (including food,) and if the kids needed to work through the afternoon, after most of the others went home, that was okay with her. As long as we followed testing protocol in the classroom, and parents and principal were aware that children were still working, we could take as much time as needed. It really helped some of my slower thinkers, who fatigued easily, and they did not feel like they had to just fill in a bubble to get out of there. Because I had already done extensive tutorials in the same room with them, and we had a comfortable relationship, that helped remove the fear factor, too, which can be a booger! The first year I did this, all of my high risk kids passed the test, even though they continued to learn at a slower pace than the others. In the following years, I was very pleased to see that they continued to be successful on the tests!
When I changed schools, and the two principals for whom I worked DID watch the clock, my strugglers were not as successful either year, so I do believe that there was a direct correlation between extra time, feeling comfortable in the classroom and with the teacher, and snacking to keep the brain working at its best. That's how I get the most done!
Good luck to you and your child. Someday, this will all pass...C. A.