Please help me correct my essay !

<p>Topic: There may be personal information you want considered as part of your admissions application. Write an essay describing that information. You might include exceptional hardships, challenges, or opportunities that have shaped or impacted your abilities or academic credentials, personal responsibilities, exceptional achievements or talents, educational goals, or ways in which you might contribute to an institution committed to creating a diverse learning environment.</p>

<p>Four o’clock at Dallas-Fort Worth International Airport, my mom, my brother and I finally came in the United States after a long and strenuous journey. We stopped at Japan, then our flight was cancelled because of the earthquake and tsunami, we waited one more day for taking a new flight to come to America. On the way to come my uncle’s house, I knew that my new life started and I had to be stronger because my dad was not here with my family.
My mom had her job after a week we came in America so I took care of my brother at night. For the first time in my life, no mom or dad stayed with me at home at night, I felt despairs; however I said to mom that I was fine so that she could work well. Every day, after school, I bathed my brother, fed him, helped him do homework and read book for him. It was not simply to look after him, I had to fight with him to finish my tasks. My brother had the symptom of the attention-deficit hyperactivity disorder and scared due to he did not see either my mom or my dad therefore I needed to be very patient, took my time to work with him, calmed him down every time he was angry or cried. So that when I finished with my brother, it was eight o’clock, I helped my grandma do some chores, brushed my brother teeth and slept with him. I had no time to do my homework until my brother fell asleep.
About an hour later, I woke up and did my own homework. I knew that doing homework at late night was not good, but I had no choice. I lied on the floor, turn on my table even thought I was nearsighted, I did not want to wake up my brother. I finished Math, Science and Social Studies because I knew these ones were easy for me. The last one was English that challenged me very much. I spent too much time to accomplish it. I used both English-English dictionary and Google translator to help me. I looked up each new word, then read again and answered the questions. At the end of the day, I learned by heart as much as new vocabularies as I could. Finally, I ended my day at about twelve or one o’clock and went to bed, I was really exhausted at this time.
My English became better after one year that I had been in the United States. I met my old English teacher and she told me “Your voice improved so much, I can hear you now”, I was so happy at that time. I signed up for some clubs at school but I chose clubs that had meeting either in the morning or after school so that I could take care of my brother. I volunteered at some community services that happened at weekend. I felt happy when I helped people or worked with kids at Falls Feast or Camp Fire. One time, my Student Councils club went to Arlington to join the leadership day, I asked my mom that could she take care of my brother for me to go with my friends ? My mom said yes and I had fun on that day.
Now, I have been in America for nearly two years. Many important events in my life happened and I made significant decisions here. Good things and bad things, both came to me and I overcame both. On the day my dad came in America, I thought that my hardest time was gone. I realized that I needed to work harder to keep my happiness right now and built up my life in the future.</p>