Is a high SAT subject score useful?

I scored two 800 on math2 and physics. I’m applying to Virginia Tech, Penn State, UC Berkeley and I’m wondering how much can these two scores increase my chance? My weighted GPA is 3.96 and unweighted 3.7, which is quite low. I’m very strong at physics and math but I’m very weak in english and social study.

@whatcolleges

How did you do how your SAT or ACT?
What major are you aiming for?

@StevenToCollege I got 1420 on SAT(math 780, reading 640)
I’m going to major in mechanical engineering or physics

@whatcolleges

Your GPA and SAT seem a bit low for Berkeley Engineering.