Before the meeting, double check and triple check your trips. Did you forget to list one or a few when you sent your application? If so, how many days of physical presence do you end up with? If still above 1095, send a webform on the spot. If all was correct, there is nothing much to prepare apart from knowing your personal history, which should be a given, and maybe have some documentation ready, like leases, work proof, bank statements, plane tickets... If IRCC needs something, they will tell you, but maybe some of it will be readily available.
And relax, you want to be a confident person that sets the record straight, not someone who looks like he's hiding something. Good luck.