UK student just received SAT II results - what does this mean?

I took my SAT subject tests on May 11th and just got my results back. I got a 720 in Literature, 690 in French and 760 in Maths Level 1. I’ve done a bit of research and there hasn’t really been a coherent answer as to the level/quality of these results. I have an ACT of 32 but am retaking it this weekend and have been getting between 33 and 36 in practice tests. I’m planning on applying to mainly Ivy League and similar highly selective institutions - what indication do these scores give? I would willingly retake the subject tests but am very conscious of the timeline and don’t want to do any essentially surplus work.
Thanks!