Hi SLR. Never applied for CSA so not sure and let's hope someone will be along to help soon. In the meantime, all I CAN say is try to relax, listen to instructions / read questions carefully and if in doubt, ASK!
Have you tried to find any practice tests on Google? Might be one on SHL.com At least if you've given it a go you won't be going in blind, so to speak...
Best of luck!