Should I superscore or not?

May SAT score: English 680 Math 570
Dec SAT score: English 670 Math 650

Should I superscore just for the sake of adding the 10 points in english? Or should I just send the December score to hide the 570 in math from may?

This is for colleges that allow me to send whichever scores I want, including Harvard.

A question of semantics, but you do not superscore; the college, if it chooses to do so, superscores. The CB sends the scores from the test dates you choose; you can’t ask them to just send the math from one date, as an example.

Now, should you send both? Yes.