If you have an extreme case of senioritis, summer school will only make it worse. Use older siblings or friends as sounding boards. Ask how they got through the final semester of high school. Look for positive, not destructive, solutions. Second semester grades are critical, so stay focused on school.
Colleges admit students pending final high school grades.
Students are often told that their senior year is for partying. When you stack college and financial aid application demands on top of school, the work load gets quite heavy. Depression may set in if you expect a slack year. Develop a plan for after graduation to keep motivated that includes college, work, the military or volunteerism. That plan may be just the cure for what ails you during your senior year.