I agree with Andrew, however, if they want that vba skill level and you do not have it, you will be found wanting in your job if you do get it. You need to spend time learning quickly. People here will be willing to help, but we can't do your job for you. The macros you were asked to write took me a little over an hour. I would guess others here could do them in less. While I've seen much trickier problems, that one calls for some knowledge of the Word Object model and vba coding.

Grant Gamble has a couple of decent courses on Udemy that could help you quickly get up to speed.

If you have other programming experience, it will not be difficult. If you do not, you'll need to learn to think like a programmer. As programming languages go, vba is not that tough and has lots of tools to help you.

Word is not intuitive and programming it less so if you do not understand Word.
Here is a good book: Writing Word Macros: An Introduction to Programming Word using VBA: Steven Roman

Here is a good resource: Word Macros and Visual Basic for Applications (VBA) FAQ. Some of my previous links are from there.

Like Andrew, I hope your job application goes well.