Given these tests are made to be machine mark-able, couldn't they do these tests in in a more random way. E.g. For a 50 question test, examiners write 300+ ques

Given these tests are made to be machine mark-able, couldn't they do these tests in in a more random way. E.g. For a 50 question test, examiners write 300+ questions and these are randomly ordered with each test paper having a unique ID linking it with question order.