my condolences for the unfortunate score. whether this is good news or bad news, i've been at the lsat since jan '05. and all the while, i've self-studied, taken testmasters, studied powerscore materials, spoke with blueprint students about their methods, yadda yadda.
quite honestly, what you see in the LRB/LGB is what you get in testmasters. TM wasn't worth my $1250 b/c i studied those bibles beforehand and got pretty much nothing from the course. and it's not worth your $625. if you can, i'd work with a personal tutor instead. depending on where you live, there might be many of them -- and one great tutor can definitely put you back on the right track.
there's a saying...
fool me once, shame on you. fool me twice, shame on me.
don't let this be shame on you... you can still study on your own and achieve a much better score. the only way to go now is up.
hope you're encouraged.