Letters / 'School of Science application is unsuccessful' - Need Advices for Appeal Letter [4]

Hi, seniors, I am an international applicant applying for admission into NUS Science, but got rejected a few days ago. Currently, I am writing an appeal letter. I think that I am qualified to be admitted into NUS Science course. However, I have no idea on how to write a good appeal letter to convince the admission committee. Below is my appeal letter. Could you give me some advices? I really appreciate for what you do for me!!

I was disappointed to find out that my application to School of Science is unsuccessful, since I personally think that I should have been offered a place to persuade my studies in biological sciences based on my A level results. Being admitted into NUS is so important to me since the things I learn from NUS are essential parts to fulfil my mission. If I can be admitted to school of sciences, under the guidance of the knowledgeable professors in NUS, I will study hard so that I can graduate with a first class honour. After graduation, I will be equipped with necessary skills to complete my master degree and a doctoral degree, with which I would be able to get in the field of research and would be able to achieve results that would make a difference to the world. I sincerely hope that you can give me the chance to pursue study in NUS. Thank you very much for taking your time to re-evaluate my application.

P.S. There is a limitation of 1000 characters for the appeal letter