What is the highest score on RIAS IQ test?

There's no single "highest score" on the RIASEC (Holland Codes) interest inventory. RIASEC isn't an IQ test; it's a vocational interest inventory. It doesn't produce a single numerical score but rather a profile showing your strongest interests across six types: Realistic, Investigative, Artistic, Social, Enterprising, and Conventional. Each type might have a separate score (often presented as a percentile or letter grade), but there's no overall highest score comparable to an IQ test.