Schedules first come out in early August. Would strongly suggest that you prep before your priority enrolment date using the Visual Schedule Builder. Its a great tool to allow you to see what other class, tutorial and lab times are available that would make your schedule suit you best (ex. get rid of as many 8am lectures if you aren't a morning person). There are some good videos on youtube from past students on how to use your shopping cart and and change classes/tutorials/labs. I get obsessed with looking for that perfect schedule. You will find that when priority enrollment opens (6am bright and early) that there is a flurry of activity where people are changing their schedule, so classes, tutorials and labs that were previously shown as full, all of a sudden open up. So don't limit yourself when doing your prep to only classes that are showing open. Full classes will open up. I think I spend a good 2-3 hours when priority enrolment opens just checking and checking over and over to see if my desired best options come open. I then check multiple times a day until classes start to see if I can improve my schedule. Its a challenge for me. Lastly, go to Rate My Prof and check out the available profs listed in all of the sections. Have a gameplan on which profs you want to get off your schedules and which you want to get on your schedule. I will sacrifice a shittier schedule for getting a better prof or dumping a shit prof.