
RAADS-R is meant to help you determine if you should get screened by a professional. It is NOT an effective diagnostic tool at all. I have a million criticisms of it but I digress, any online test is not going to be very helpful because of the automatic limitations, miscommunication, and bias an online test creates/is influenced by.
It is not nearly as accurate as embrace autism (the company that makes it public) presents it as. It was never designed to be taken without a professional and has a relatively high rate of false positives/negatives when self-administered. Embrace Autism is a very shady company and financially benefits from convincing people that they should look for an autism diagnosis.