How long does BlackStone recommend?
 In general, we advise students to spend two months preparing for the CASPer. We advise this duration because there is a variety of different skills to learn, a breadth of understanding to gain, and because you must be confident enough in your learning that it stands up to the intense pressure of the CASPer test.
The CASPer assesses your behavioural tendencies – essentially the way in which you approach situations and other people – through providing you with a range of real world scenarios, and asking you for your feedback on them, or how you might approach them yourself. The team behind the test therefore claim that it is largely impossible to revise for it, but as the huge amount of prep material for other SJTs (situational judgement tests) across the world attests, preparing for these kinds of tests is possible – it just takes some time.