DUOLINGO
- Certifications that you can add to verify your English level: Duolingo Proficiency Exam in English
- You can get English verified as Native/Bilingual by taking the English Certification test by Duolingo. There is a fee for the certificate
- You can take the test on Duolingo and add it to your profile by clicking Share Certificate on Upwork.
- https://www.coursera.org/articles/duolingo-english-test
- Test online anytime, anywhere, for free