As above, Schaums Complex Variables is a very good book at the price of it (probably about £5 off amazon). The Demystified CV book is pretty good, not fully looked through my copy yet (only received it about a week ago) but from what I have looked at it seems very good for the price, maybe a bit clearer than the Schaums version since these tend to look a bit dated nowadays but the maths is still the same, and the bonus of the Schaums version is that there are about 10^8 questions crammed into each one and the Schaums CV has a couple of formula's I've never seen anywhere else that tell you how to more easily calculate the residue of "a more involved" pole rather than doing it by the longhand methods that will be taught in the lectures.