I'm exhausted

I have recently moved to Japan to study as a high school student here, and I am getting overwhelmed and exhausted with everything here. And I have to take the high school entrance here, knowing that my skills are lacking. What am I supposed to do with my life?

It started first with my mother asking me if I want to study in Japan. Comparing to my country the Philippines, Japan seemed like a better choice to be in. So I said yes, I wanna study here. But my mother asked the same question when I was younger as a joke, and I thought she was doing the same thing here, but I was wrong. I learnt that she was serious about it 4 months before this day. I was shocked. And I was casually told that I needed to move here in Japan to be able to take the exam, before I even get to graduate. My heart broke, and was in denial about it. So I spend those times to have fun with my friends for the last time. I tried to ignore about it as much as I can, and study a little time to time to get rid of the guilt I had.

But now I'm here, with my parents in a small apartment, far from all my friends. Plus my grandmother died all of a sudden, the day before our planned date to meet and have some lunch together. I needed to go to my mother homeland and spent 13 days in there, which meant I couldn't get to study. And now I have exactly only a week to get ready. And as a teenager, it is also getting hard for me to only be with my parents. I never really had a close relationship with my parents, because they were always busy with work. Not only is this sudden closeness feels awkward to me, but also suffocating.

I can speak and understand enough Japanese to be able to live through the day to day things in here, but I can only read and write easy Japanese. I'm stressed about everything, disappointed to myself, and is low-key planning to just kill myself off if I can't pass this exam. Please help me