This thread will help explain:
http://www.macinsiders.com/showthrea...5.html?t=60645
See the 'SOLAR ENTRY - What to expect' section:
When SOLAR opens for course selection in June (date depends on your faculty and year - level 1 is first years, level 2 is second years, etc), you will select your courses and which semester they go in (1st semester, 2nd semester).
Once you do get into SOLAR, you'll be able to select all the required courses in order to get into your program. However, the ELECTIVE courses do have limits to how many students can be in the class. Therefore, some of the elective courses you want may already be full by the time you log on. Because of this, you will want to have some backup elective courses planned out and written down that you can quickly choose if it shows that one of your electives you wanted is full.
When SOLAR re-opens again in July for everyone, there is an 'ADD/DROP PERIOD' which means you'll have a few weeks to change the courses you selected earlier. And those Elective(s) you wanted that were full? Well, this is the chance to go back and see if any of those opened up again and there are any spots left available. Spots can open up because a student changed their mind and dropped the course (ie. switched to something else), or sometimes courses that are popular will get more spaces opened to them. So keep checking to see if the courses you want become available.
On August 6, 2013 your timetable will be released and viewable in MUGSI. SOLAR will have automatically picked your Core, Tutorial, or Lab sections to create for you a conflict-free timetable.
You may or may not like the way they put your schedule together but don't worry! Starting August 8, 2013 at 8:30am, SOLAR opens again (click here to see the dates). You will have the option to go back into SOLAR and change the CORE, TUTORIAL, and LAB times around to make a schedule you like better (depending on what is left available).
REMEMBER: The Electives that you tried to get into earlier but may have not been able to take because they were full before, might have an opening around this time, so be sure to go in and check to see if they are still full. If they aren't full, you can drop one elective and replace it with another that is available.
The last day to add term 1 and 3 courses is September 13, 2013.
See more dates here:
http://registrar.mcmaster.ca /regis...sessional.html