Should i retake SCH4U

Im in grade 11, but im currently doing grade 12 courses (adv functions, English, and business) my grades for all are 95+, but my chem is questionable, im in the low-mid 80’s rn. Should i retake it in grade 12 for a higher grade (if i wont average at least a 90)? Would that affect my chances of getting into uni, im hoping to apply to queens HS; would they care? If i redo it should i do it ns or day school? Thank you in advance