Meet Our Content Team
Our questions are crafted by experienced educators and language specialists who understand exactly what it takes to succeed on English proficiency exams.
Michael Goodine
TOEFL expert and founder of TOEFL Resources. Over a decade teaching English in China, Korea, and Paraguay. Deep expertise in TOEFL scoring systems and ETS assessment standards.
Kate Feng
International school language teacher with over 20 years of experience. Specializes in creating engaging, culturally-aware content that helps learners master English communication skills.
Zhao-Hui Xu
Educational leader with 27+ years in international bilingual education across Asia. Former Executive Principal at BIBS Beijing with deep understanding of multilingual learner needs.
Ryle Eddings
Founder of WorldViewtraining.com. Has trained managers and teams at Google, Novatek, Salesforce, and Bosch in intercultural competency, public speaking, and effective English communication.
Ririn Arnita
TOEFL and IELTS educator with deep roots in the Indonesian English learning community. Has helped thousands of students achieve their target scores through practical strategies and accessible teaching methods.
Geraldine Williams
TEFL-certified English teacher and content creator specializing in TOEFL preparation. Creates engaging practice materials that build both skills and confidence for exam success.
Daria Zhiberina
TOEFL and IELTS expert with extensive firsthand experience taking official exams, Daria brings an unparalleled understanding of test patterns, question evolution, and the real test-day experience to create practice content that truly prepares students.
David Vardazaryan
TOEFL instructor specializing in speaking and writing strategies. Trains students to produce clear, cohesive responses and teaches practical techniques for all four sections.
Our Core Principles
Exam-Aligned Questions
Every question mirrors official test format, difficulty, and scoring criteria. Our content creators study real exam materials to ensure authentic practice that prepares you for test day.
Accurate AI Grading
Our AI grading is calibrated against official scoring rubrics and evaluates responses the same way human raters do.
Expert Validation
Every question is reviewed by experienced English proficiency test educators. Our team includes teachers who've prepared thousands of students and understand exactly what makes questions effective.
Real Test Experience
Practice tests that replicate your exam with the same timing, format, and pressure. When test day comes, nothing will surprise you.
How We Build Content
Most test prep content is either too easy, not aligned with actual exam patterns, or graded by AI that doesn't understand official scoring standards.
We built PrepEx to be different.
1. Questions Match the Real Test
We don't create questions that look like exam questions. We create questions that are exam questions in everything but name.
- Same complexity: passage length, vocabulary level, and reasoning required
- Same traps: the distractors that catch real test-takers
- Same timing: practice under real time pressure
If practice is easier than the real thing, you're not actually preparing.
2. Grading You Can Trust
Official exams use specific rubrics to grade Speaking and Writing. Our AI is trained on those exact rubrics.
- Speaking: evaluated on delivery, language use, and topic development
- Writing: scored on organization, elaboration, and language control
- Detailed feedback: specific ways to improve, not just a number
Petra, our AI coach, doesn't guess at your score. She evaluates your response against the same criteria human raters use.
3. Built by People Who've Done It
Our content team includes:
- Teachers who've prepared thousands of students for English proficiency exams
- Test-takers who've sat for exams 15+ times
- Content creators who've built followings teaching test strategies
They know what works because they've seen it work.
4. Continuous Improvement
Every question is tracked. If students consistently find something confusing or unfair, we fix it. If a question doesn't discriminate between skill levels, we replace it.
Our content gets better every day because we measure everything.
Are you a teacher or tutor?
If you're an experienced English proficiency test educator or language specialist, we'd love to hear from you. Join a community of experts dedicated to helping students reach their goals.
Join the team