If curriculum already implies academic, is it redundant to say I have equipped myself with a diverse academic curriculum? Also, is curriculum plural (is "a curriculum" appropriate)?
Curriculum doesn't imply the academic. Curriculum refers to courses and subjects that are taught in academic institutions.
Academic curriculum is a correct phrase that means a curriculum relating to academic. However, it's advised to not use that phrase since it hasn't found its way on Ngram
Curriculum is singular and a curriculum is appropriate. The plural form for curriculum is curriculums