[header] How to graduate grade 12 [title] Ensure that you're taking the right courses. [step] When you get your list of classes, double-check to make sure that they're what you wanted, and what you can handle. Some high schools actually recommend not having a full course load and leaving yourself a spare block in grade 12 so that you're not overwhelmed. 
Make sure that you're not in classes that are too difficult, either. It's great to challenge yourself, but taking advanced math if you barely passed last year probably isn't a good idea.