<p>What is the difference between Biology E and Biology M for SAT subject tests? College Board says they have a different distribution of question content, but I don't really understand the difference. Is one easier than the other? Do I have to take both? Do colleges care which one I took?</p>
<p>E has more questions about ecological material. M has more questions about molecular material. There are specific percentage breakdowns of the different topics for each one in SAT II Bio prep books.</p>
<p>As for which one would be easier, it depends on which one you’re better at. That one would probably be easier to you. I think E uses a little more critical thinking/common sense while M can be memorized (although you still have to use critical thinking for the scenarios that they give you). So if you like the little details, take M; it is more predictable in this way.</p>
<p>You do not have to take both. In fact, you cannot take both of them. 60 questions are “common core questions” (you answer them whether you’re taking M or E). 20 questions are E, then another 20 are M. You pick which set (E or M) you want to do. You bubble in which one you want to do on the test day on your answer sheet, although I don’t think you’re supposed to look at the actual questions before you choose.</p>
<p>Good luck!</p>
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<p>It would be best to decide which set to complete before the administration. I would choose based on individual talent and/or preference.</p>