The questions on this site are run by the OpenMark assessment system which handles your access to a question as if you were taking a real assessment. However this site provides you with considerable flexibility as to how you access these demonstration questions and if you use all of this flexibility you may break some of the rules that are applied to more formal assessments.
One rule you may break is an 'Access out of sequence' error. If you see one of these errors, you now know why. Just click on the link provided to 'Return to the test'.