Should I retake the Chem SAT II with a 740?

Hey guys, so I took the SAT II for Chem in June this year and got a 740. I am thinking about taking it again. I know I am taking the ACT next year in September, and the SAT in November. So I guess I’d retake it in December. I don’t know if its worth it or not. Maybe I’ll forget everything by then. But I really want a higher score. Should I try or not? Anyone have experience in this?