I have been quite lucky with my interviews so far I've had no specific questions academically.
I was asked the usual questions you'd expect such as , Why study at this university, why aerospace engineering? What do you think of maths and physics? What are you studying in maths/physics at the moment? Where do you see yourself in 10 years? Also some brief comments on my statement.
Other people on the same interview day mentioned they were asked to do differentiation questions. So I'd say make sure you're comfortable on all your differentiation/integration work. Chain rule etc.