NO. Attending SLE does not improve your chances of appointment at all. You get no WCS points for SLE and WCS points are what matters. If you want to improve your appointment chances, attend Boys/Girls State.If you was selected to go to SLE would that mean you have a better chance to get into West Point?
My son, a yuk at WP, did not attend SLE. He attended boys state. Boys state gives you points, SLE does not.