Even a small time left in school is meaningful. final exams overall scores are important. A diploma is important. Years from now a job will be important. If you have children extra money will be important. It is hard to live with nothing! A high school education is hardly enough to find a good paying job these days never mind no high school diploma at all. School is your job ! What will you do when someone is paying you in a future job, Not go because you don't feel like it??? You are setting yourself up for failure by not applying yourself . No one can do this for you. You are in charge of your future. Things you pay for are valued things you get for free usually aren't , but education is not free like you think. You need to value it because it will pay you back! You CAN raise your grades but be honest with yourself , you don't want to make the effort. That says a lot about your character! It's time to change its so easy to do nothing and let others do it but not with education. It is the core to who you become. you will remember this when you proudly reach out for your diploma, knowing you chose to help yourself.
It's best to attend school for the last of the year. It's not good to dismiss it as it will make a difference in your studies. Deciding that you can't raise the F is not best. Strive and work hard and most importantly, have a positive mind set in your studies and with time, you will improve your grades.
If you are just there to waste the teachers time and that of other students I would say no, however keep in mind that you go to school for yourself and no one else. Take full advantage of this opportunity. When you get out in the world looking for a job and you fill out that application there is the question do you have a high school diploma??? Now you could say no and mark that you have a GED, personally I have never been asked what GPA I had. As a manager who has to hire help when they see yes there it means that you can follow directions and complete a task. Please keep in mind school as tedious as it is sometimes is will prepare you for the rest of your life even if you just do the very basic of studies you are going to need those skills