Hi. I also have a teen with special ed issues. There are such a wide range of LDs, it's really impossible to answer your question without knowing more about your child.....Something to realize is that Texas is one of the only states in the U.S. to use the term "Dyslexia" and they often have different programs established for kids with it, than say, for kids with ADHD or physical disabilities....
I'd recommend that you contact a local support group in the Dallas area for whatever your child is diagnosed with and network through those parents to find out the best schools and other resources in the community. (ie, www.thearc.org or www.autismspeaks.org for kids with Autism/Aspergers, or www.chadd.org for kids with ADHD, or www.interdys.org for dyslexia, etc.)