Practice in a blank graphing window. Do not rehearse on a personal Desmos account full of notes, folders, and saved graphs. The test build will not have those. What it disables is in disabled Desmos features.
Match the keypad you will get
Open a fresh graph. Use the keypad for exponents, fractions, and trig. Set degrees or radians from the wrench every time, because a home default will not carry into the test. That switch is in radians versus degrees. Whether you may use Desmos on test day is in Desmos on the ACT.
If you might test on paper
Paper Math does not include Desmos. If you are still choosing a format, do not let a graphing habit become the only way you can solve. Format choice is in digital or paper ACT, and practicing on paper for a digital test date is a separate question in practicing on paper for a digital test.
The bottom line
Blank window, testing keypad, no saved notes. If a trick only works because of a folder you built at home, it will not be there.
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.