I think the test is a good method of assessing the ability of the person being tested. There are some things that could trip someone but I feel the allotted time works well.
The actual exam is to filter the person and ceritify him based on his solidworks knowledge. The sample exam is a partial representation of the exam, if it is a true representation of the test (Like model exam) everyone can easily clear the exam. Then it will not be like testing a person's solidworks skills and knowledge and certifing him.