My D20 had very similar scores (780/680) and just submitted her applications tonight (to elite LACs). She didn’t have any SAT subject tests but did submit AP scores (all 5s). She took pre-Calc last year and in taking IB math now (her opinion is the math she is doing now would not help at all on the SAT). We used a private tutor for math because she just lacked confidence. They worked exclusively on Algebra 2, since that is the extent of math on the SAT. All of the feedback she has gotten from GC, private admissions counselor, and school interviewers has been very positive. One Dean of Admissions told her this week that seeing students with score differences is very common there and they expect to see it because the environment at that specific school allows students to explore their strengths and interests. If your D is not looking for a STEM major, I think she is fine but ask me again in December when we hear the ED result!