lol. its a pretty easy course imo.
I think its useful, exposes you to the computing side of maths which is pretty important.
If you have space then definitely do it, if not, then up to u?
and yeah apparently u need it for applied maths.
It'll also help if you plan to do MATH3311/MATH5335 Computing for Finance.
The first things you learn is like rounding errors in double precision, to like quadrature rules (integration) i.e. simpsons rule, trapezoidal and more complex ones.