Ivies do NOT prepare you for the MCAT. No school prepares you for the MCAT. The premed prereqs are just basic science classes, nothing special. The bio, chem, ochem, and physics material is taught everywhere. It’s basic stuff.
MCAT questions are not like a science test.
Going to a slightly less competitive school will be “easier” to maintain a high GPA if you put in the work. It’s not going to be easy.