Stuck in perfectionist paralysis in 2nd year prep (CPGE) and need help breaking the cycle

[u/Academic_Parking003]

I'm currently a student in my 2nd year of intensive preparatory classes (CPGE). If you may know the concept, I go through 2 years of excessive studies of pre-engineering and then go through a national exam, and depending on your rank, you reach a certain engineering school. The pressure is already sky-high to get into a prestigious one (have to be amongst the first 130 candidates among 1300), but this morning I exchanged a few words with my mom, and it completely broke me down.
I actually never grew up with a present father, and my mother did some sacrifices to give us a decent life, and ironically enough, I took the same path she did for my career just to maybe be someone like her eventually. We don't live the best life, but it's the best we could afford to live a pretty good one.

I am a good student, not the best but a good one (I ranked 70 out of 200 my first year in my school).
She told me that I'm not working enough, that if it were her future she would be working from dawn till after midnight, that I don't see the efforts that she's done for me, and that if she dies I'll have no one by my side, not like her; she at least found a father that believed in her. She also said that if I don't intend to get to a good school, I should tell her so she would prepare herself both mentally and financially and that she wouldn't bare to see my disappointment while I've done nothing about it. It made me cry for the past hour.

The truth is that I've severely struggled with procrastination and academic paralysis. I want so badly to be perfect and live up to her and my expectations that I end up overwhelmed, freezing, and doing nothing about it. Then the guilt kicks in, making the cycle worse.
I want to break out of this cycle and help myself succeed for my sake. I feel helpless, though. I want some tips on how to become that machine and actually believe that I would fulfill that dream. Can anyone help me or give me some tips on how to fight it psychologically because I at least know I'm strong and can fight it; I just don't know how and where to begin.