the key to the pst: your guide to success with inside info and full practice pst  in the key to the pst, you'll discover step-by-step instructions on how to dominate the first hurdle to a successful job interview at one of the most prestigious strategy consulting firms of the world: mckinsey. if you want to get inside knowledge on how to ace your mckinsey problem solving test, then look no further! <br> <br>next to tips on how to prepare for the pst and what to do during the test to maximise your chances, you'll find the practice pst invaluable to your preparation. just like the real pst, it features 4 cases with 26 questions, covering all skills a consultant in the field would need. every question comes with a detailed explanation, so you can learn from every mistake without risking a lost job opportunity.