I would start studying now. IMHO. Make sure that you follow the Sheppard Air study strategies and you’ll be fine. The ATP/CTP course DOES NOT prepare you to take the ATP written. Like a previous poster said, it’ll be crash videos and war stories from the retired airline guys teaching the course. See if you can to get a good time slot to take your written. My last sim session ended at 0200. I was slated to take the test at 0900 that morning. We spoke with the admin people and got them to moved it to 1000. Sim times are assigned by lottery. Maybe you’ll get lucky. It also depends on your ATP/CTP class size. Mine was small (7). There were classes with over 15 per class and they were running multiple classes. Good Luck.

GB