First, take a deep breath.
Second, while the RIAS is good at giving you a range it is not the gold standard of IQ test. In fact, it is most often used as a quick and dirty IQ measure when you are going to look at cognitive processing/achievement to look for a learning disability and certainly not to look at a variety of skills to measure giftedness. Also, the nonverbal subtests on the RIAS measure very different skills than say the PRI on the WISC-IV. Also, I am sure your son will develop better verbal skills in school but reading is typically a function of strong language skills and while it may improve some skills, like vocabulary, it is typically the child that already has very strong language skills that is the early and ravenous reader.
In addition, your son is still very young and there may be some regression to the mean as he gets older. In addition, language skills make up the bulk of what is learned in school in early elementary years and he is functioning in the average range in that area.
All that to say, he sounds like a bright little boy, nurture his talents. However, he is the same little boy that you knew before these test results. If you thought this school was a great fit then, it probably still is now.
