It always puzzles me when people say "teach to the TAKS." Perhaps I'm missing something somewhere, but the TAKS is Texas' accountability testing, e.g., it is to show how well the schools are teaching the students.
Further, the TAKS test are predicated on Texas Essential Skills and Knowledge (TEKS). In short, the students must master the TEKS before they can be successful on the grade equivalent TAKS.
You can find the TEKS by grade at
https://web.archive.org/web/2008121...a.state.tx.us/rules/tac/chapter111/index.html . It's the TEKS (curriculum) that make up the TAKS.
If you will look at your child's TAKS report to the parent, you'll find the "Objectives" listed. They will correspond to the TEKS.
If you want to review released TAKS tests by grade, you'll find them at
https://web.archive.org/web/2008121....assessment/resources/release/taks/index.html . The corresponding answer key will tell you what questions correspond to which TEKS.
The bottom line is that if your child is struggling with TAKS, he hasn't learned grade level curriculum, e.g., TEKS. Whether it's due to lack of appropriate instruction and/or unidentified neurological problems should be the focus.
And you bet, if he's in a TAKS reading group, he having problems with reading. The school will not put him in a TAKS reading group just because they don't have anything better to do. If you'll compare his reading TAKS categories and scores to the TEKS, it should give you a good idea of where his primary weaknesses in reading are (but it won't tell you the "why?")
It's been my experience that the TAKS reading group is great for teaching students that are lacking in instruction. They teach additional reading strategies also. But it's also been my experience that the TAKS reading group does not remediate or treat reading problems like dyslexia, language based reading problems, etc. To get to the underlying problem, and thereby remediate or treat the real problems, appropriate testing is required.