English is a very hard language to spell. In part since whereas most languages are spelled the way they are pronounced, English sort of reflects pronounciation in the 15th century, when Normal French and Anglo-Saxon were still merging into modern English. Also English’s power comes from its ability to absorb many words from other languages, together with their own spelling quirks.
In all fairness, yeshiva graduates are just as good at spelling as most other people. It would be nice if we all had “posh” language skills, but that’s not realistic. Actually, given that the typical hareidi kid in the USA is trilingual (English, Hebrew and Yiddish), he’s in a good situation to develop serious linguistic competencies if he needs to.