Maybe I should have been more specific.
Major and content agnostic standardized tests are useless at the college level.
This should be fairly obvious; I think you have to do some work to believe it's possible that it isn't true. How can you measure how well a university prepared a student if you don't even know what the student majored in?
On thing you can measure some fairly rudimentary stuff they should have had coming in (grammar, basic math, etc.). But this is answering the wrong question; universities shouldn't be responsible for catching students up. It's a disservice to people who actually wanted to take the course in which the review happens.
The other thing you can do is measure generic "critical thinking". But I think this sort of test is ripe for abuse. I don't trust college administrators to not abuse it. And besides, generic "critical thinking" isn't. See the link I posted in my other response here.