<p>One of my schools does so I didn't know if I should send one to all of them.</p>
<p>Depends on college, many do, many more do not. You should check with each before doing so. Most of your higher ranked colleges and many others that make their decisions in late February to early April require them. An exception to your higher ranks is public universities such as the UCs which do not want mid-year reports and make decisions based on grades through junior year.</p>
<p>Private colleges that use the common app typically do, state schools are less likely to use them. Check the websites thoroughly, especially if your midyear grades aren't as good as the rest of your grades.</p>