Well, you could always take Mandarin 2 (? or did you place into 1?) and take Latin 1 too as a elective…?
You’d have to continue Mandarin till Level 4, but you could drop Latin after level 2 to leave space for electives. Note that if you’re a Chinese heritage speaker aiming for Top 25 universities/LACs, you’re better off taking both rather than just Chinese. Indeed you’re supposed to learn a “foreign” language, and being able to present subject tests in both languages would also definitely help you (vs. presenting Chinese results, which wouldn’t really, same as if a French student took the subject test in French.)