Hi, I'm Chinese student looking for some tips for improvement in my OI studies. I have been working hard in this subject and although I believe my efforts are not in vain, my performance in school contests has been consistently poor. I feel discouraged with my low ranking. Can you provide me with some suggestions or techniques that can help me improve my performance within the next two months? Thank you very much! Please forgive me for any mistakes in my English. I am using ChatGpt to assist me in amending it.