Is it possible to bring my gpa up during the first semester of senior year????

I am currently a junior, and I have an unweighted gpa of 3.7. I am planning on sending my applications in mid October. If i hypothetically begin to ace my classes, do I have a good chance of bringing my gpa up before sending my applications in??

Algebra. You should be able to figure out how much you can affect your grades in one semester.

Not unless you take some summer classes that would be included in your GPA prior to applications. Also many schools will ask for 1st semester grades but those come out after the application has been sent so they may help you if you are a borderline candidate but probably will not be included in your original application GPA.