It's lacking. On the academic side, your child would do very well and be ahead of the public schoolers by 1-3 yrs. The teachers are great and caring, but the administration thinks they know you better than yourself or your parents and pay the teachers way too little compared to the school fee. P. E. is once or twice a week and you only get about 5 minutes of recess if it doesn't rain or snow. There is a big workload on the students. The adjustment to high school would be very difficult due to the lack of clubs and social activity. No late bus is available if joining one of the few clubs.
LISG is a private school for grades pre-K through 9. Not being a public school means that it not beholden to the absurdities of public school education like common core and inane political correctness. The teachers are caring, intelligent and have the best interests of your child in mind. One of the best decisions that I have made regarding my children's education.
My son attended LISG and loved it. This school is NOT for every child. It is only for gifted children who love to be challenged. Curriculum in most grades is about 2 grade levels above good public schools like Cold Spring Harbor or Jericho. By 9th grade my son had completed most of the course work requirements of NYS to graduate from high school. He took AP and college level courses after leaving LISG. Like most of his class mates from LISG, my son got admission in three of the top IVY Leagues. My son played soccer, tennis, baseball and lacrosse outside of the school. He was chosen in the tennis team of the high school after leaving LISG.