There is no need to "study" more than a few days prior to the test. Just take the practice test on the CASPer website and watch the few youtube videos with tips and tricks and you should be good to go. Dont overthink it, just be a normal person. State the main issue, take a stance, and explain both sides of the argument.
Right, sorry. I just meant when should we take the CASPer by? By the time I submit my secondaries or before then?