<p>Beginning with Upenn, since it is the one on the top of your list and is representative of most that require subject tests: it requires two subject tests in different subjects. Thus, if you submit math 1 and math 2, that counts as only one test toward the two required. If you submit more than the two required, it considers no more than two subject tests in determining admission, usually the highest two. For certain majors, it recommends specific subject tests. For engineering, it recommends math 2 and a science. For Wharton, it recommends math 2 and another of your choice. Thus, you should take math 2 for it and one in another subject of your choice. If you score two high scores you are done for Wharton, but if you score low in that second test other than math 2, you may consider taking another because if you score high it can replace the one you scored low on.</p>
<p>The other colleges that require subject tests are similar except some actually require, not just recommend, a math and science for engineering and a math for business and for some that math requirement is for math 2. Most of the colleges that require subject tests consider the highest two for admission. Harvard and Princeton require two but will consider any sent although if you have two with high scores, the others will not have a significant impact (e.g., if you have 4 800s, that fact alone won’t mean you will be considered better than someone who submits only two tests with 800s). </p>
<p>Outside of the 20 colleges that require subject tests, you also have colleges that instead recommend subject tests (e.g., Stanford), and those that neither require nor recommend them but will give them some consideration if provided (e.g., UChicago). The recommend group of colleges usually recommend two, although Johns Hopkins and Georgetown recommend three. Like required colleges, those usually do not view two tests in the same subject, such as math 1 and math 2, as being more than one test. Also, the “recommend” colleges often recommend a math and science for engineering or a math for business, and particularly for engineering that recommendation is often for the math 2 (e.g., the UCs that recommend subject tests). Stanford, which is in the recommend group, appears to stand alone among that group as recommending math 2 for all applicants if you submit a math. </p>
<p>Those that consider, but neither require nor recommend, subject tests, will consider any sent but you should not assume submitting them is going to greatly enhance your chances for admission or that submitting more than two is going to make any difference at all.</p>
<p>There are also colleges both in the above groups and among those that do not even consider subject tests for admission that recommend a language subject test, not because it will be used to determine admission, but because it will be used after you are admitted to determine placement in language courses and thus that could be a third test to take even if you have two others with high scores.</p>
<p>Bottom line is that you need two, and in your case a math 2 and not the math 1 should be one of those, and in some cases taking a third can help to replace another lower score or may possibly be used for placement after you are admitted. Moroever, if applying to Hopkins or Georgetown you should have three. You can take all you want (College Board has no limit other than no more than three in one day) but do not do so on the assumption that submitting a lot of subject tests is going to give you some significant advantage over those that submit only the number required or recommended.</p>
Since I assume it’s for top colleges, it’s always good to present your best “profile” and to have that flexibility.