They might that actually brings up an interesting question I wonder how many students actually retake the LSAT? Your logic that a LSAT taker who was overconfident on their first try could just retake, but in reality imagine the majority of LSAT takers give it one shot and that is it. I have no evidence to back that up, but it would be interesting and actually objective stat as to whether someone retook the LSAT.
As the charts suggest, the answer to your question is "philosophy, engineering, and math/physics"Which makes sense as all of those majors are oriented towards critical thinking, which is all the LSAT tests for. I think that most people headed to law school are not about to jump into a physics course, but I would recommend taking a couple philosophy classes if you're interested in training your brain. Formal logic is generally regarded as very helpful, Aristotle may also be a good place to start. Best luck in your studies.