You should say:
I promised my younger sister that I would help her prepare for her final school exams, especially in math, which she was struggling with. I committed to tutoring her every evening for at least an hour, no matter how busy my schedule got.
I made this promise to my younger sister. She was feeling overwhelmed and anxious about her upcoming exams, and since I had a good grasp of the subjects she was struggling with, she turned to me for support.
Honestly, it was quite difficult to keep at times. I was juggling my own studies and part-time job, and there were days I felt completely drained. However, I knew how much my support meant to her, so I pushed through and stayed consistent with the tutoring sessions.
I made the promise because I could see how much pressure she was under and how much she needed someone to believe in her. I wanted to be that person. I knew that even a little bit of guidance and emotional support could make a big difference in her confidence and performance.
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