i think it would be sufficient practice for the rc, i know a lot of people dont like search & destroy but it really jumped my rc averages from 18-19 to 21-24, but that said my DAT isn't for another 2 weeks, lets see how i do then. i would really recommend practicing an rc test with s&d and see if it helps you, also READ FAST. just think about it this way.. your score depends on how many questions you answer correctly, not whether you understand the passage(which you will.. i'm just exaggerating) or could write a paper on it etcc. go into it thinking i have to answer as many questions as possible correctly. this will get you reading not only faster but smarter.
hope it helps!