<p>You take it in May next year like everyone else. You can’t take it any other time. Just express your intent to take the test on your application. You may want to send in a supplement with a printout of some code from a program you have written and a few screen shots detailing how it works, if you like, to show that you know whatever language you wrote the project in. </p>
<p>Doing extracurriculars that require knowledge of coding would also help.</p>