Advanced English Duolingo Test

I'm looking for a freelancer to create a challenging Duolingo test in English.

Key Requirements:
- Advanced Level: The test should be tailored for high proficiency learners.
- Comprehensive: It should cover vocabulary, grammar, and reading comprehension.

Ideal Freelancer:
- Proficient in English: A native English speaker or an expert in the language.
- Experienced in Language Testing: Familiarity with creating challenging language tests.
- Duolingo Background: Previous experience with Duolingo, either as a user or a creator, is a plus.