If you are contagious, feverish, or cannot sit for two-plus hours, move the date. Sitting sick to "get it over with" is how a real Composite gets replaced by a bad morning.
Move it
Change the date before you leave the house if MyACT still allows it. Change registration. A last-chance calendar: last-chance retake.
If you already sat and it went badly
A same-day void is a narrow tool. Read the current rules before you ask. How to void a score.
The bottom line
A fever is a date change. A mild cold you have sat through in class can be a sitting. Do not hero a Composite you will just retake.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
This article offers general ACT prep guidance. The ACT can change from year to year, including its format, scoring, policies, test dates, and fees, so always confirm the latest details on the official ACT website at act.org before you make decisions. ACT® is a registered trademark of ACT, Inc. thirty-six is not affiliated with, endorsed by, or sponsored by ACT.