<p>LOR - letter of recommendation from teachers. My child went to the same private school from K-10. We moved when she was a junior. She went into the IB program at her new school, but still found her old private school to be more rigorous. Books they were reading in 12th grade English HL were books she already read in 10th grade English H. We thought about keeping her at her old school or go to a BS, like Lawrenceville, but ultimately she decided 2 years in a Spanish speaking country was going to be a great experience for her. The transfer didn’t harm my kid’s college application because she was a big fish in a small pond at her new school (she graduated as Sal), but in OP’s case, the D may graduated below 10% at her new school. Even top BS schools can’t guarantee their top 10% can get into top 20s nowadays.</p>