Avoid the VK PDFs. The few dollars saved are not worth the legal risk, the missing audio, or the potential malware. Invest in a legitimate copy—or use the many free, legal resources that Cambridge and its partners provide. If you'd like a rewritten version that focuses strictly on the legitimate features of the Objective PET book (without mentioning VK), let me know and I'll be happy to provide that instead.
For millions of students preparing for the Cambridge B1 Preliminary (formerly PET) exam, Objective PET by Louise Hashemi and Barbara Thomas is a gold-standard textbook. Its structured units, authentic exam tasks, and audio resources make it indispensable. So, when a student types into a search engine, they are expressing a clear need: I want this high-quality material, but I cannot or will not pay for it.
However, I must point out an important distinction: Sharing "Objective PET" (Student's Book, Workbook, Teacher's Book) as free PDF downloads on VK violates copyright law.
Karya Umum 
Filsafat 
Agama 
Ilmu-ilmu Sosial 
Bahasa 
Ilmu-ilmu Murni 
Ilmu-ilmu Terapan 
Kesenian, Hiburan, dan Olahraga 
Kesusastraan 
Geografi dan Sejarah