Don't worry about how long your post is. I'm happy to read every word. I too am a university student. I understand exactly what you are saying. I also was unprepared for an exam last week. Had I studied I should have made an A(top marks), but I got a C(average). And I'm also falling behind on my group projects.

I'm sorry you can't afford the laptop you need and I truly hope you will find the strength to carry on and finish your education.

Is it possible your school offers counseling services to students? Might be worth looking into. Best of luck to you.