Frum men who stay frum somehow learn satisfactory English, and many of them are exteremly successful. The running insider joke is, “I learned it in Satmar college.”
Satmer specificly to the exclusion of many (I SAID MANY! 🙂 Chassidus’ value work and have a strong work ethic (for those who go out to work, they go all out). That helps them to succeed more than any “english” or College skills could.