This typically depends on your school district’s policies. My old high school counted each semester separately, and the one I’m in currently averages both semester grades, then uses that final grade as part of the GPA calculations.Your best bet is to refer to your school’s website, or stop by the school office and ask. Good luck!
Typically, Semester 2 Grade is your Quarter 4 grade and your Semester Final averaged together. So if you got an F for Quarter 4 and an A or B for your final, You would likely get a D or C for your Semester 2 Grade, giving you a passing grade.
So, yes your Semester 2 grades would be the overall class grade.