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.
Aydin Ismayilpur
Professional ESL teacher and IELTS instructor with over 11 years of experience. CELTA Pass B holder, 120-hour TESOL certified, and an overall IELTS Band 8.5 scorer.
Dr. Clive Walker
English language educator with a doctorate in eLearning and more than 14 years of experience. Founder of Walker Higher Education, where he develops digital resources for TOEFL and IELTS learners.
Miguel "Mike" Marcano
Founder of OMG TOEFL and a TOEFL specialist with more than 15 years of experience. Perfect 120 and perfect 6 scorer who helps candidates reach demanding academic and professional English targets.
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.
Julian Mendez
ESL instructor with the Canadian government and former Cambridge English speaking examiner. Helps immigration-focused learners prepare for CELPIP and IELTS through practical exam training.
Sathish Kumar Vellamuthu
CELTA- and TEFL-qualified English trainer with more than 20 years of teaching experience. Prepares learners for IELTS, OET, PTE, CELPIP, and DET, and trains professionals in Business English and communication.
Kiera Ayres
IELTS and CELPIP coach and founder of Prof Prep. Teaches students around the world through engaging virtual classes, practical strategies, and communication-focused instruction.
Rachna Kocher
Certified test preparation trainer with over 19 years of experience in international education. Has mentored thousands of students and professionals preparing for CELPIP and other global English proficiency exams.
Harini Vivekananda
TEFL-certified English communication and test preparation specialist with more than eight years of experience across IELTS, PTE, CELPIP, spoken English, voice and accent, and corporate communication training.
Nataly Kyi
IELTS exam specialist and language coach with 18+ years of teaching experience. Helps ambitious learners improve Speaking and Writing through research-backed coaching and targeted exam preparation.
Jackson Butchart
PTE expert with 15 years in the field and a former PTE examiner. Has spent more than eight years writing questions and tutoring students, including learners who went on to Duke, the University of Michigan, and Oxford.
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.
Daria Zhiberina
English proficiency test strategy and content specialist. Daria follows format changes, question patterns, and learner pain points across PrepEx's test portfolio.
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.
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.
Niyaz Mammadov
English and IELTS instructor with an overall IELTS score of 8.5 and Band 9.0 in Speaking. TESOL/TEFL- and TKT-certified, with a student who achieved 120/120 on TOEFL iBT.
Daniel Reed
DET tutor with 5+ years of experience and English tutor with 21+ years of experience. Reviews practice content across reading, listening, speaking, and writing.
Maria Dharshini
PrepEx founding engineer focused on DET product and content systems. Maria builds practice experiences and checks task flow, feedback, and content quality.
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