My niece and nephew attended a French immersion private school until the 8th grade when they switched to an all english high school. They were grade skipped twice and have DYS level IQs and are very proficient in several fields (she in ballet and violin and he in tennis and debate). But, the transition to mainstream high school was hard for them because they learnt math and science in French. They had Ivy league ambitions and the potential to get there and now they are facing the reality of applying to a state university instead. Their family feels that the immersion program was a mistake for their kids who were interested in the STEM fields.
The problem, IMO, is with universities using industrial metrics like GPAs and bubble test scores to measure students, not with double-grade skipped kids who speak French and English like natives and are very good at non-academic pursuits. Admissions to elite schools should be cakewalks for kids like your niece and nephew.
Please see the very end of my last message in this thread.
