Are final exams reflected on your 4th quarter grade or just 2 semester grade?

It depends on the school's grading policy. Some schools include final exams as part of the fourth-quarter grade. Others weigh the final exam more heavily and use it to adjust the overall semester grade (which encompasses the entire semester, including the fourth quarter). Still others might use it for both – impacting both the fourth quarter grade and the final semester grade. There's no universal answer; you need to check your school's grading policy or syllabus.