You may have been writing your tasks directly in your tree-testing software. This is more likely if it’s a simple test – a small tree with a small number of tasks.
You also need to mark the correct answers in your tree-testing software. The mechanics of this will depend on which software you’re using, but in all cases, be sure to mark all the correct answers for a given task (see ~”Identifying correct answers” above).
Next: Letting participants skip tasks