The scoring macro is not distributed. A) It's a complex program. and B) There is the whole security aspect.
The sample questions provide the look and feel of actual test questions and are not intended to assist with preparation for the exam. Consider them an advanced look to be used early in the preparation process to provide some insight into the type, format, and difficulty of the questions. Therefore, complete rationale / solutions are not provided. Of course, you can still use these for practice, but that will include the process of determining why the right answer is right, and in the case of a lab question, what the actual code will be. Not a bad exercise.
The free practice exam for the A00-232 exam does provide full solution code for lab questions.
While the practice exam also does not make use of the scoring macro, the introduction video on the credential page describes the macro and shows exactly how to use it, starting at about the 3:50 mark.
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