You can just take the LSATs again when you realize you blew it the first time, but you can't just go out and marry a Jew after you decide it was a mistake to marry out--especially not if there are kids, that complicates things immeasurably.

On the other hand, you can get married quickly to a nice Jew if you know someone who makes shiddachs, but you can't just quickly retake the LSAT and expect a different result. You need to crack the books. To be honest, if you didn't start early on, you're in trouble. It's easier to learn the material if you study hard all the way through law school rather than study hard for the exam itself.