1. You go to all of the lectures for that core class every week (usually 3 50 minute classes per week, or 1 3 hour night class)
2. On your first day of class, they will let you know which half of the class starts with the lab, and which starts with the tutorial, and the dates of all labs and tutorials that you need to go to.
3. You should go to the first one to get an idea of what it's like. Then go whenever you feel like you need help or if you have specific questions about the material. They're especially good before tests, as TA's usually drop hints and they help a lot. They're the reason I passed my arch nemesis chemistry with flying colours.
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