"For example my D took HS level math and Spanish in middle school and the grades were on the transcript sent to colleges and did figure in her GPA. "
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Just because a transcript has MS grades does not make it relevant for college admission decisions. Colleges recalculate applicants GPAs using their own formula regardless of the school system. I seriously doubt they take into acct grades earned in middle school
if they looked at MS grades too, that would put the vast majority of applicants whose transcripts do not include those grades at a disadvantage.
4 years college preparation means 4 years.