If you want to add a block of randomly chosen questions from the question pool to the test, proceed as follows:

• Under Reuse Question, select the Create Random Block option.
  The Create Random Block screen appears.

• Select a Question Pool.
  You can see how many questions of the various types are in the pool.

• Select the question types you want to use and specify that you want to use all questions as a source.
• Click on Submit.

You now return to the Test Canvas, where you can see from which Question Pool the questions will be drawn and which question types will be used.

• Under Number of questions to display, specify how many questions you want to be drawn from the pool.