['It was such a relief that I knew the work they were doing in school.', 'What type of work are they doing at school?', "It was calculus and i hadn't done it in 2 years."]
Ah, I see. Well, it's been a lot longer since I did calculus. Good on you, remembering that stuff!
When I first registered for university after having been out of school for 4 years. I wasn't sure if I was still going to be able to do the work.