What Subjects Would a Mechanical Engineer Need to Take?

My friend wants to be a mechanical engineer, preferably working for a worldwide company. He is taking physics, maths, further maths, but he needs to choose between taking design technology and german. Which would be more useful? Thank youu!
Design and technology would be more useful. And now i’m a sophomore majoring in aerospace engineering.
Design technology. He can earn an income from it, and help people.