Yes but do they know the phonetic sound of the letters of the alphabet ?
Just knowing the names of the letters is useless when it comes to tackling an English word ...
...take CAT for example !
From my travels (and having lived in Singapore, Malaysia and Hong Kong ) , most ex British colonies /territories have residual spoken English skills (in the case of the Philippines it was/is the long time American influence. )
I believe that if a (foreign) language is not used regularly it gets lost.
How many of us still remember our school boy French or Italian or Spanish ???
Where English is required, such as aviation, medicine, hospitality international business etc , it is usually quite proficient.
My Thai wife only learnt to speak English fairly well because, when she was young, she worked here in the British Embassy for 10 years.