cambridge series 5-6-7-8 ...are enough... pick a couple of cambridge books out of this.
i borrowed books cambridge 5 and 6 from a friend of mine and tests given in those books were a real thing.
you are given a choice between a pen and a pencil for your writing section. 9 out of 10 students opts for the pencil for the very same reason.
it is mandatory to use the pencil for your listening and reading sections since answer sheets go through a readable machine etc