Well, they use them at my school and it suppossedly has the highest pass rate in the city so I guess the answer to your question is yes.
However, I think if they are going to put so much emphasis on these tests they should count for something. Since they do not, they usually get moved to the back burner. With these tests, we have a chance to remediate. Our theory exams are another story. I also don't like how my school uses the scoring to determine pass/fail. They don't go by the actual percentage scored on the test but on your program percentile. It has to be above the 60th to not be remediated. The program percentile is the pits. Two of us had only a 1-2% difference in the actual score, but he was in the 78th percentile and I was in the 58th. From a difference in 1.6%?!?!?!?!?:angryfire That's quite a spread there for such a small difference in actual score. Another classmate scored 2% less than me and was in the 6th program percentile.
Now for us (my class) it's not a huge deal for the school to use the program percentile to determine pass/fail. (Other than it being a pain in the butt to remediate when you already don't have enough time to do what you have to do as it is.) On the other hand, the class after us (next year) must pass on the first try. If they use the actual percentage scored, it would be fair. However, if they use the program percentile like they have been, they are going to have a huge mess on their hands. That number has too many variables attached to it.
Off my soap box and onto a positive note, I have found the non-proctered tests to be good review/practice. Hope my being a windbag has been helpful.