Any test of mastery can be used to infer ability by comparing the relative mastery of the material by the person who is being tested with the mastery that would be expected, based on their age, the amount of time they prepared for the test, the amount of time that they were allotted to finish the test, etc.
However, that does not make a test of mastery into a test of innate ability. If you do not know how old the person being tested is, how much they prepared, and how long they had to finish the test, you cannot know anything except that they were able to answer these questions correctly, and therefore have mastered this material.
The only thing that you know about the abilities of the person taking the test is that they have been able to master the material, or at least been able to master the ability to provide the correct responses to these particular type of questions on the material.
We do not know whether they have not mastered the material because they have never learned it, because they process too slowly to be able to respond correctly in the time allotted, because they lack the processing ability to ever master the material, or even because they are early stage ESL learners.
That means that the tests, on their own, tell us nothing about the innate abilities of the test taker.