Statistics for Most Difficult Languages for English Speakers

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Difficulty Tier	Number of Native Speakers	Language	% Correct
Category III	~150 million	Russian	95%
Category IV	~128 milion	Japanese	93%
Category IV	~920 million	Mandarin	93%
Category IV	~350 million	Arabic	90%
Category IV	~80 million	Korean	89%
Category III	~341 million	Hindi	85%
Category III	~76 million	Vietnamese	84%
Category III	~80 million	Turkish	81%
Category III	~36 million	Thai	78%
Category III	~45 million	Polish	73%
Category III	~300 million	Bengali	71%
Category III	~14 million	Greek	71%
Category III	~13 million	Hungarian	71%
Category III	~70 million	Farsi	70%
Category IV	~80 million	Cantonese	66%
Category III	~62 million	Urdu	66%
Category III	~40 million	Ukrainian	63%
Category III	~16 million	Khmer	62%
Category III	~23 million	Tagalog	62%
Category III	~21 million	Serbo-Croatian	59%
Category III	~75 million	Tamil	58%
Category III	~13 million	Kazakh	56%
Category III	~30 million	Lao	55%
Category III	~33 million	Burmese	53%
Category III	~11 million	Czech	53%
Category III	~30 million	Azerbaijani	52%
Category III	~34 million	Uzbek	52%
Category III	~16 million	Nepali	51%
Category III	~82 million	Telugu	44%
Category III	~11 million	Turkmen	40%
Category III	~32 million	Amharic	38%
Category III	~17 million	Sinhala	37%
Category III	~21 million	Kurdish	30%
Category III	~22 million	Somali	26%
Category III	~21 million	Dari	15%