> My understanding is that's what SAT/ACT were moving towards about 10 years ago, that it would be computerized and "everyone's test is personalized" by the elo system probing your exact knowledge level from a bank of questions with difficulty scores dynamically based on how "similar ranked" students performed on that question.

That is indeed where they're moving. They've recently announced that the SAT will be transitioning to a digital, adaptive test in the next 1-2 years. [1]

Notably, the upcoming iteration of the test will only be semi-adaptive, adjusting the version of the second half of the test based on your performance on the first half, rather than adapting to your performance on a question-by-question basis.

I suspect overall this will be an improvement in the accuracy of the results. As it stands, for students with a strong math background, a majority of the math questions on the current test are far too easy and cloud their results on the rest. With the recent removal of the CollegeBoard's math subject tests, high-level math students have very few opportunities to demonstrate their knowledge using a standardized metric.

[1]: https://newsroom.collegeboard.org/digital-sat-brings-student...