I only had a refresher course in English, which I actually needed. It helps me to this day. I severed my employment with TWI 10 years ago this August. I'm glad I don't have to list them on my resume any longer.
Added to keep on topic: Other than the English, nothing I did at TWI helped me with my career nor did it help make me more valuable in my line of work. I worked in Word Processing for the first 3 years. They were still using a DOS version of WordPerfect. They didn't upgrade to a Windows version until the year I moved to another Department. This was in the late 90s. They should have changed to the Windows version much earlier than that. And just what is wrong with MS Word, the most used word processing program? It reminds me of the BetaMax days.