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It's getting harder to fit all the badges in the picture. In studying for the certification exam, it appears that some topics may be tested with only one question. The general strategy is to focus on the main topics. This is a good approach but it has the potential to leave some easy questions on the table.

I'm finding that the Trailhead modules are a good (and fun) way to study for those sections. In the end I need to get at least 65% of the questions right; the test does not really care what section they come from...