UCs and CSUs have a concept called validation of lower level courses with completion of higher level courses. This can be applied to math and LOTE (language other than English). For LOTE, completion of high school year 3 validates high school year 1 and 2. Essentially, this means that UCs and CSUs count the highest year completed as the number of years of LOTE.
https://admission.universityofcalifornia.edu/counselors/files/csu-uc-a-g-comparison-matrix.pdf