SAT Subject Test Scores

I took the SAT Subject Test in May. Got a 720 in Math II and 760 in Bio M. I am looking to go to a more selective college, but should I retake the exams to get a higher score? I am not sure if they will be competitive, especially when applying for Ivy League schools. Also, I am planning to take my SAT in June, so would not be able to take them then. Thanks!