Chance for these schools?

UMass Amherst
UMass Boston
UMass Dartmouth
UMass Lowell

GPA: 4.0 (as of May 2018, unweighted)
SAT: 1370 (EBRW: 600; Math: 770)

Extracurricular activities:
Freshmen and Sophomore: class representative for student board
Junior: Treasurer of student board
NHS member since sophomore; NHS president in Junior Year.

I’d say really good chances at all of them. Your stats are high for those schools. Try applying for the honors college at Umass Amherst, you might have a good shot! If you take the Sat again and get 1400+ you’d be an extremely strong candidate. Overall, I’d say all of these are definitely targets, some also safeties. Maybe even try at places like BU, which are a bit more reach but have some good merit

You have a good chance at them all. Your stats are high enough that maybe consider some other prestigious state schools like Penn State and Uconn. They might give you honors college and merit depending on your major. Maybe give BU a shot as a reach school.

In my opinion you’ll get into them all easily. Good luck!