We are native English speakers but my son spoke another language at school from the age of 2 until the end of K. His K scores were lower than we thought they should be and he missed the cutoff for the HG program we wanted him in by a few points. A year later his scores were almost a full standard deviation higher in both verbal and NV. The director of his school said that in her experience, children will mostly catch up in language around 2nd grade and eventually surpass monolingual speakers. A speech & language therapist told me that testing might also be affected by cultural differences between their academic culture and the culture of the language the test is written in.
I'm not familiar with RIAS but DS did not do nearly as well on the gifted testing administered by the school district as on the SB and WISC.
