Dear uncle,
I hope you're doing well and enjoying your life to the fullest. Regarding my academic concentration, things are going well, and I've taken good care of my health. I have a little problem paying for my school fees since Dad's work is having some issues and is also having trouble receiving his salary. I wanted to seek for help with my school fees. I need to pay for my expenses immediately. This letter will include a pdf file of the sum and additional information. I am extremely grateful, uncle.
Thank you for your help,
Your loving niece
Your Name