If I took the SAT and took the ACT, and I apply to a college, do I have to send both? or can I send only the ACT.
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Depends on the university you are applying to.
In almost all cases you can send whichever one you want. An exception would be Stanford who wants to see all test scores. If you took ACT with writing it can replace SAT Subject Tests at about half the colleges that require them
Send whatever you want. Permanently Delete the scores you don’t like. So if any college requires all your scores, the Deleted ones no longer exist.