Distance runners often train for longer distances than their races. Why? Because running longer distances builds their endurance for their shorter races. Conversely, a runner who runs shorter distances may find themselves "gassed out" at the end of a longer race if they've never trained for it because their bodies don't have the physical endurance for the race.

The same is true for the LSAT. Although it is four sections, only three are scored - one is "Experimental" and is there for LSAT question research purposes. However, you still have to complete all four sections on the day of the test (your "race"). Because of this, I would suggest being ready to do all the sections, because you never know if your experimental section will be first, last, or anywhere in between; you actually have NO idea which one it is! So why not give them all your best shot?