Mahdiyah20

Salaams, This year , Ramadhan has fallen on a very important study and exam period of mine as these exams will determine whether I get into University. Due to this, I haven't been fasting as having water improves my concentration whilst learning. I tried fasting and struggled to concentrate, got very tired and struggled to understand concepts. It was my niyyah to fast this month, and every morning I make an intention to fast, but then break my fast saying it is hard for me to study. I do taqleed of Ayotallah Sistani, who says break the fast when it is unbearable, and I find it unbearable to study without any water or energy. I tried fasting at night but struggled a lot as Im not an evening person and have never been able to study in the evening. I live in the UK where the fasts are 19 hours long, so it becomes very difficult for me. Could you advise me on whether I should be paying kaffarah on this and what I should do? Thank you