I took some test in 8th grade. I know that some colleges only accept tests taken 5 years prior and i don't know if they will accept it or not (I took my test before the 5 years, but received the results near beginning of 9th grade)
I think that it more likely depends on what score you got on it. Whether you took the SAT or the ACT, retake it to get higher grade (especially since those tests cover high school topics.
Hope that helps!
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