Need for other books like kaplan or Bpp

Hi every one i am in australiya here there is no distributor for books this time i want to appear for P2 and P3 is there neccessary to buy kaplan or bpp books to passout this paper or if i will use opentution notes and lecture that will be enough for the passing P2 and P3 paper please guide me for this as i want to start if i will buy online books its toooooooo much costly for me.