My DS went last year and we had a discussion going, or a few of them. Search on here for CIET, and go way back in the results to May and June 2015. There is even a link to what the schedule was. However, since that was the first year of CIET, I bet things will be different this year. Maybe a little, maybe a lot, but different.
Just be in shape, be prepared with whatever is on your packing list, and prepared to learn and also to go with the flow. Good luck, and I hope those prior discussions will answer some of your questions.