Nah... it is a simple polynomial function, nothing fancy with trigonometric functions or logs. High schoolers should be able at least to calculate maxima, minima and limits, If they don't know one of them, they'll have lower scores. If they don't know any, they should fail.
And what does the score mean, anyway? If all the math questions are like that is either you know how to drag numbers into the formula and your score should be close to 100% or you don't and your score should be close to 0. Good tests should have some easy questions, some average questions and some difficult questions. In that way the score means something and universities would be able to accept students according to the score of the test, not to your football skills, money your parents have or the service you have done to your community.
have anyone tried the test I linked? I am curious.