We're not looking for specific quantitative skills, as in our experience quantitative skills tend to be quite transferable. For example, within a Bachelor of Economics, you'll gain quantitative skills from the maths and statistics (or econometrics) classes that you take. The "brief assignment" within the application form makes this more concrete: If you can complete that exercise, you already have many of the quantitative skills that would help you excel in this sort of role.
Yep, I can share this in a DM