I need information on about accreditation and requirements on florida high schools, punlic and private schools?

I have a 17 year old son who went to a private school in Miami Dade county for 6 years the schools name is Lincoln Mart schools and we just moved to Sebring, Florida Highlands county and he is in 12th grade and when the school Sebring High School recived is credits from Lincoln Mart School in Miami, Dade County from 9th and 10th and 11th grades Iam being told that the school Lincoln Marti schools is not a accredited school Yet they are being accredited by the Bilingual Schools ociation (BISA) Please i need help with this problem?