In the same way that in the past being able to do fast, accurate calculations in your head or on paper might have landed you job as a "computer", today technology makes the idea of hiring someone to be a computer absurd. And therefore any tests that test someone's ability to multiply and divide large numbers is basically a worthless test in today's world.
Fields where there's value humans can add won't be cheatable by AI (at least today's generations). Tests in these fields will hold value. In some cases it will mean the education and tests will evolve to educate and test areas where humans can still add value - arguably this has already happened in maths. But many fields could be replaced entirely.
I don't mean to sound unsympathetic to those who's jobs and professions will replaced by AI in the coming years and decades. It makes me sad that someone could spend years obtaining and perfecting skills which might soon become redundant, but for better or worse AI systems like ChatGPT will fundamentally change the value of some skills and educational fields. The sooner we accept this the better we can adapt society for it.