No, cancelations do not show up on your score report per the latest update/ change.
It is not really material anymore whether you keep or cancel your score. Since cancellations no longer show up, seeing a score report with a single 700+ score, Schools don't really know whether the person took the test once or 10 times and canceled the previous 9.
Also since you can resurrect your score for a humble $50 fee, as long as you have money, and it sounds like you do because you're taking a test knowing that you're not ready, you absolutely can cancel the test unless it's the score you need. Just make sure you save the print out with the score on it and the date so that two years later when you need to restore this particular score you can look it up on the print out. As of recently learned when you try to restore the score, it does not actually show you what's score it was simply a date when you took the test.
Go and take the test boldly. You actually don't even have to decides to cancel it at the test center you know have 72 hours to make that decision after taking the test
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