Can I Take Both E And M Of The Sat Biology Subject Test?
I need two subject tests to apply to the College of Arts and Science at Boston University and am going for a Computer Sciene degree. Can I take both the E and M? Also if I can; any tips on studying for it? Thanks. 
Yes. However, make sure your college does not require subject tests in separate subjects; most colleges do. If Boston University does, then sciences such as Chemistry and Physics are off limits too. Why not take a Computer Science related subject to show your passion, such as Math II? Or, take English- it’s important to be good at English for any major or university. Otherwise, take a language you are fluent in but did not take high school classes in, to show off otherwise invisible skills.
Good luck!
You may not take Biology E and Biology M on the same day. I would also suggest not taking both of them (it wouldn’t help much) but instead, diverge your subject and take Math II.
To study for the Biology test, I suggest buying Princeton Review’s Cracking the SAT Biology E/M book. It covers all the topics very well and the practice tests are decent.