<p>Two different things are being discussed here: (a) whether a college requires you to provide all scores, and (b) whether the college uses highest scores for admission, either by combination of highest section scores from multiple tests or using test with highest composite. As to point (b), all colleges use for admission either highest section scores from multiple tests or, alternatively, that test with highest composite. For that, it makes no difference whether the college requires all scores to be sent. For SAT IIs, for colleges that require or recommend IIs, they will use, depending on college, either the highest two or consider all sent.</p>
<p>As to point (a), a minority require “all scores” to be sent but what that means varies. For a small number that means all SATs, ACTs and SAT IIs; for others it may mean only either all SATs or, alternatively, all ACTs, and then may or may not mean all SAT IIs; for others it can mean all SATs but you can send just one ACT score and then may also mean all SAT IIs or your choice of IIs.</p>
<p>Stanford requires you to provide both all SATs and all ACTs but you can choose which SAT IIs to send. As to ACTs you have the option of submitting all official scores from the testing agency or instead one official score and then self-reporting the others on your application (all official ACT scores must then be provided after you are admitted).</p>
<p>UChicago lets you send whatever you want but it does superscore SATs so it can help to send all. Note, it neither requires nor recommends SAT IIs. It also does not use the writing section of the SAT or the essay scores from either and does not require the optional essay portion of the ACT.</p>
<p>If a college is fine with score choice, such as UChicago, it is not going to ask you to submit scores you withhold. Those that require all scores, have, as a matter of the obvious, already demanded that you submit scores when you submit any scores as part of your application and thus they are not likely going to repeat that requirement by sending you a special request afterwards.</p>
<p>For those thinking of trying to conceal scores from a college that requires all scores, you are correct to assume that exercising score choice means College Board will not send a score and will provide nothing to tell the college that you withheld a score. However, your high school may be your likely snitch because many put on your official high school transcript that is sent to colleges all of your scores.</p>