I thought it is standardized as per
AMCAS Section 4
It states
AMCAS GPA: AMCAS will convert most standard undergraduate transcript grades to AMCAS grades based on conversion information provided by the institutions. The
AMCAS GPA provides the medical schools with a standard way to compare each applicant's background. The BCPM GPA is comprised of Biology, Chemistry, Physics, and Mathematics courses. All other coursework will be calculated in the AO (All Other) GPA.
Accordingly, GPA among UGs are not standardized but AMCAS GPA is. Am I missing something here?