Ask HN: Upcoming university interview, what should I learn?

I'm a 20 year old web developer with no A levels (I left high school at 16, for you Americans), next week I will be attending a university interview to study Software Engineering at BSc level, what interview questions should I brush up for, and which Maths would be good to cram the night before?

For reference, I can implement Bubble sort, Quicksort, etc, though don't really understand the maths behind big O. I can do statistics to a decent level, hypothesis testing, etc.

I have already searched Google and the results were mediocre at best, better to ask my peers.