Can my depression linked to the fact that I've been constantly stressed out because of school for 3 years?

Okay, 2 years ago I was very stressed out, because I was preparing for exams in my dream school. I was very scared of failing, thus worked my ass off all the time for a year. If I ever had free time, I studied. I failed. On the next year I was especially stressed out and became desperate. Thought about exams literally every single day of the year. Fortunately that time I passed. I thought that my sufferings were over, but then I realized how hard it is here. Basically, if you do shitty-normal here, you're kicked out. Now I'm constantly stressed about being expelled. We also are about to have 2 rows of exams. If you fail 1 of them - you're kicked out. You can't try second time. This is ridiculous. I'm constantly thinking about the fact that I may be forced to go back to my shitty old school that I hated. For 3 years in a row I did nothing but study, but this year something happened to me and I became apathetic and hell of depressed. Could this be linked to the fact, that I got fed up with all this bullshit and just need to take a break? honestly, this year I felt so shitty that i slacked most of the time and feels that I'm already taking a break, regardless I still feel shitty. Maybe that's just stress and I got fed up with such lifestye? Is this possible? Anybody with similiar experiences?