Should I study for SAT Subject Tests?

I have this stereotype that Harvard can and might even will reject students with no SAT II. My school does not offer the best education{except maybe math}. I was thinking of studying until January for both Math II and Bio, but is it even worth it? At the same time I am studying deliberately for the SAT to get a good score until Oct or Nov as I have procured a score of 31 on my ACT. And during all of this time I have to write essays for 12 colleges not including supplementary ones.

What path should I take for the best of my interests?

According to Harvard’s Common Data Set, the 25th percentile ACT score is 32, meaning that 75% of accepted students have that score or above: http://oir.harvard.edu/files/huoir/files/harvard_cds_2013-14.pdf

So, your ACT is below Harvard’s 25th percentile – and IMHO that’s a bigger torpedo to your application than SAT Subject Tests scores, no matter what they might be. So my advice is to work on your SAT, and don’t sweat the SAT Subject Tests.

But my score is 660 in Math II. I kinda regret that I have even have taken it. So should I just work hard for SAT & try to rectify my SAT II math score? Also, other colleges might require all scores to be sent.

Even if you had 2 SAT Subject tests, each with a 750-800, your ACT is still considered on the low end for Harvard. Having wonderful SAT Subject Test scores does not offset your ACT score. So, I would focus completely on raising your ACT/SAT score.

Thank you @gibby .