When I was eleven years old, it was a very good year, and I can remember my daily routine vividly. These were the years before I owned a Sony Playstation, and I used to venture to my friends house - everyday after school - to watch him play through Final...
Don't always go for the obvious colour. Sometimes, it's better to think first.
Take as much time as you want - there's no limit.
Look for squares on their own, for these are the toughest to clear and should be a priority.