Law School Discussion

So I was waitlisted for test in October today . A bit late to register, I know, but still, I am within the deadlines. I wanted to pickup the center withing two-hours driving range, all of them were unavailable. I know the exact location where I want to take the test, I mean it's preferable. I just do not want to be sent to Montana test center from CA. How are waitlisted students being informed of opened seats? Does LSAC guarantee, that a seat, any seat, will be found before the test day? Anyone, who had the same situation, what was your experience with LSAC? 
If I asked the same q, that's been asked before on the board, I am really sorry. I checked 15 first pages, couldn't find any similar to my topic.

Weird question, I know . Last year I bought some official LSATs from Ebay, that've been answered by another person, and the answers were heavily marked by another LSAT taker . No matter how hard I tried to erase mark outs and circles I could still see the marks. The same story with the LSATs I've already taken(I took LSAT test two times, passed it in December, was accepted to one school, but decided to take the last shot this October). I have Kaplan's books, Testmasters books, official LSATs,-all of them marked with a pencil. Normally I erase all the marks possible, and after that I evenly cover them again with a pencil, so I will not notice any marks, however,  it's very time consumming. I have to see those a,b,c,d,e and mark them off every time I answer. I wonder if anyone has come across the same problem. What do you, guys, do, when you want to retake or to reanswer, except for mere erasing? I've learned that for every problem in U.S. there's a solution, probably I just do not know about some stickers, something that may help . Tired of wasting my time for erasing.