| Difficulty Tier | Number of Native Speakers | Language | % Correct |
|---|---|---|---|
| Category III | ~150 million | Russian | 95%
|
| Category IV | ~128 milion | Japanese | 94%
|
| Category IV | ~920 million | Mandarin | 94%
|
| Category IV | ~350 million | Arabic | 93%
|
| Category IV | ~80 million | Korean | 90%
|
| Category III | ~341 million | Hindi | 85%
|
| Category III | ~76 million | Vietnamese | 80%
|
| Category III | ~80 million | Turkish | 79%
|
| Category III | ~36 million | Thai | 78%
|
| Category III | ~14 million | Greek | 73%
|
| Category III | ~13 million | Hungarian | 73%
|
| Category III | ~45 million | Polish | 72%
|
| Category III | ~300 million | Bengali | 71%
|
| Category III | ~70 million | Farsi | 68%
|
| Category III | ~40 million | Ukrainian | 68%
|
| Category IV | ~80 million | Cantonese | 63%
|
| Category III | ~62 million | Urdu | 63%
|
| Category III | ~16 million | Khmer | 60%
|
| Category III | ~23 million | Tagalog | 59%
|
| Category III | ~13 million | Kazakh | 57%
|
| Category III | ~21 million | Serbo-Croatian | 57%
|
| Category III | ~75 million | Tamil | 57%
|
| Category III | ~30 million | Lao | 55%
|
| Category III | ~34 million | Uzbek | 53%
|
| Category III | ~33 million | Burmese | 52%
|
| Category III | ~11 million | Czech | 50%
|
| Category III | ~30 million | Azerbaijani | 49%
|
| Category III | ~16 million | Nepali | 48%
|
| Category III | ~11 million | Turkmen | 44%
|
| Category III | ~32 million | Amharic | 41%
|
| Category III | ~82 million | Telugu | 40%
|
| Category III | ~17 million | Sinhala | 32%
|
| Category III | ~21 million | Kurdish | 28%
|
| Category III | ~22 million | Somali | 23%
|
| Category III | ~21 million | Dari | 13%
|