The RAADS-R Autism Screening Tool
According to Embrace Autism, "The Ritvo Autism Asperger Diagnostic Scale–Revised (RAADS–R) is a self-report questionnaire designed to identify adult autistics who “escape diagnosis” due to a subclinical level presentation."
Particularly if you were AFAB (assigned female at birth) and you're an undiagnosed adult today (especially if you still identify as a woman), there's a strong chance that you've picked up some solid "masking" skills.
Masking simply means that you appear neurotypical in presentation. You've noticed how to "act" neurotypical, plus much of the diagnostic criteria is based on outer behavior rather than internal experience.
My psychologist had me task this screening tool using this website: aspietests.org/raads/ (online scoring). You have to create an account, but I never got spammed or anything.
Originally, I took the screening (with online scoring) through Embrace Autism here.
I found a printable version of the RAADS-R here from NovoPsych. The downside is that there isn't a scoring key with this. However, you can read how to score your results on the Embrace Autism page here.
Psychology-tools has posted the RAADS-R here with online scoring as well.