How PrepEx Measures Your English Proficiency
Our diagnostic test provides precise, research-backed proficiency assessments using three internationally recognized frameworks: TOEFL iBT, IELTS Academic, and the granular CEFR Plus scale.
Three Scales, Complete Clarity
TOEFL iBT
The gold standard for academic English assessment. Required by 11,500+ universities worldwide for admissions.
IELTS Academic
Accepted by 10,000+ organizations globally. Essential for UK, Australia, and Canada applications.
CEFR Plus
Granular proficiency mapping used by European institutions. Provides precise sub-level assessment.
Why Granular CEFR Matters
Traditional CEFR uses six broad levels (A1, A2, B1, B2, C1, C2). Each level represents a significant proficiency range. A student at B2.1 has notably different abilities than one at B2.3, yet both are simply called "B2."
PrepEx uses the CEFR Plus framework, which divides each level into three precise sub-levels (.1, .2, .3). This gives you a clear understanding of exactly where you stand and how close you are to the next milestone.
Proficiency
TOEFL 110-120 | IELTS 8.0-9.0
Advanced
TOEFL 95-109 | IELTS 7.0-7.5
Upper-Intermediate
TOEFL 72-94 | IELTS 6.0-6.5
Intermediate
TOEFL 42-71 | IELTS 5.0-5.5
Elementary
TOEFL 24-41 | IELTS 4.0-4.5
Beginner
TOEFL 0-23 | IELTS <4.0
Basic user with limited language production and comprehension.
The Value of Sub-Level Assessment
Standard CEFR levels cover broad proficiency ranges. A student at B2.1 (TOEFL 72) differs significantly from one at B2.3 (TOEFL 88), yet traditional frameworks label both as simply "B2."
PrepEx provides granular CEFR Plus sub-levels, giving you precise insight into your current position and clear milestones for improvement.
Real Progress Example
Traditional CEFR would show no progress (all "B2"). Our system reveals three distinct advancement milestones.
Our Conversion Standards
Our score conversions are derived from official concordance tables published by ETS (TOEFL), Cambridge Assessment (IELTS), and the Council of Europe (CEFR). We've enhanced these with granular sub-level mappings based on statistical analysis of student assessments.
| TOEFL iBT | IELTS Band | CEFR Plus | Proficiency Level |
|---|---|---|---|
| 118-120 | 9.0 | C2.3 | Near-native proficiency |
| 115-117 | 8.5 | C2.2 | Excellent command |
| 110-114 | 8.0 | C2.1 | Very good command |
| 105-109 | 7.5 | C1.3 | Operational proficiency |
| 100-104 | 7.5 | C1.2 | Advanced proficiency |
| 95-99 | 7.0 | C1.1 | Effective operational |
| 88-94 | 6.5 | B2.3 | Upper-intermediate+ |
| 80-87 | 6.5 | B2.2 | Upper-intermediate |
| 72-79 | 6.0 | B2.1 | Vantage level |
| 57-71 | 5.5 | B1.3 | Threshold+ |
| 49-56 | 5.0-5.5 | B1.2 | Intermediate |
| 42-48 | 5.0 | B1.1 | Threshold level |
| 36-41 | 4.5 | A2.3 | Basic user+ |
| 30-35 | 4.0 | A2.2 | Waystage |
| 24-29 | 4.0 | A2.1 | Elementary |
| 0-23 | <4.0 | A1 | Breakthrough |
Why This Diagnostic Works
Our assessment methodology combines adaptive question selection with multi-modal AI analysis to provide precise proficiency measurement in a fraction of traditional testing time.
Complete Coverage
Reading, Listening, Speaking, Writing
Results
Detailed breakdown immediately
Assessment Time
Efficient proficiency evaluation
Expert Assessment Technology
- ETS-aligned scoring rubrics for objective assessment
- Proprietary phonetic analysis for pronunciation precision
- Advanced AI grading trained on official TOEFL criteria
- Statistical modeling calibrated to real test performance
Diagnostic scores are projections designed to identify your current level and guide study planning. Official test scores depend on preparation, test familiarity, and test-day performance.
Adaptive Difficulty Weighting
Not all questions are equal. Our diagnostic uses adaptive difficulty weighting to maximize assessment accuracy with minimal questions.
Traditional Assessment
Full TOEFL: 54 questions, 3-4 hours
All questions weighted equally, regardless of difficulty. Requires extensive time commitment.
PrepEx Diagnostic
Diagnostic: 9 questions, 10 minutes
Strategically selected questions across difficulty levels, weighted by discriminatory power. Optimized for accuracy with minimal time.
AI-Powered Assessment
PrepEx combines three industry-leading technologies to provide human-level grading accuracy across all four skills.
Speaking Assessment
Our AI provides phonetic analysis, pronunciation scoring, fluency metrics, and real-time transcription. Advanced language modeling evaluates topic development, coherence, and task completion using TOEFL rubrics.
Writing Assessment
Our AI analyzes essays using official TOEFL writing rubrics, evaluating organization, development, language use, and task achievement with structured output validation.
Reading & Listening
Official ETS conversion tables map correct answer counts to scaled scores. Questions are selected across difficulty levels to maximize diagnostic precision.
Ready to Discover Your Level?
Take our 10-minute diagnostic and receive your TOEFL, IELTS, and granular CEFR assessment with personalized study recommendations.