Yes, I didn't do further maths either and so the first year maths module hurt a bit! Some particular maths topics that are likely to come up that you may not have covered in detail before:
-complex numbers
-matrices
-differential and partial differential equations
Apart from maths though, I wouldn't worry too much. Unless you really struggled in maths or physics there is no need to get a head start, except thermodynamics perhaps, if you didn't cover it in Chemistry or Physics.
Some courses have programming modules that you may have had no experience of before. My course had MATLAB in the first year, and Python is another common choice. I ended up really enjoying the programming modules and even did some programming in my spare time.
from a Uni. Southampton MEng grad