Objective Proficiency contains twenty short units providing a wide range of challenging topics and offering lively yet systematic preparation for the Proficiency exam. Ten lessons focus on the Paper 3 summary task, building up appropriate skills gradually. Authentic language examples taken from the Cambridge International Corpus illustrate a wide range of real English usage. The course is written by experienced examiners who have an in-depth knowledge of the Proficiency exam, and contains material informed by the Cambridge Learner Corpus which shows typical mistakes and areas of difficulty for candidates at Proficiency level.
I still consider Cambridge textbooks one of the best on the market for learning English. Rarely did I find a textbook to help me improve all my language skills. I also appreciated the fact that I got to learn a myriad of new vocabulary, idioms and phrasal verb. If I were to give me honest opinion, I would say that Cambridge Publishing should be the safest bet when it comes to learning English on the long term.