GPA UW - 3.4
SAT - 1150 but took one on October 6 so I don’t know what I got yet
Solid ECs (2 sports, 2 clubs, club officer, volunteer work)
Work Exp - business internship, paid coach
I want to study business but am going as an undecided applicant
Essay - reviewed and edited by 3 English teachers
6 Honors/APs
1 academic excellence award
out of state
From what I see on prepscholar, UMass Amherst has an average incoming GPA of 3.8 and an average SAT of 1290. I am not sure if this is weighted or unweighted. I think that you have a chance and that it is probably worth applying, but it does not look like a safety for you.
Admissions at UMass Lowell would be safer if you want to consider applying there in addition to UMass Amherst.