（英语翻译啊）请问这句话用英语该怎么说啊?缺少了老师的帮助和同学的陪伴我的复习效率大不如从前.因此在高考中没有发挥到自己应由的水平,也与我理想的大学-上海财经大学失之交臂,成为我人生最大的遗憾.

Without the help of my teachers and classmates,my revision efficiency is not as well as before.Therefore,I hadn't played my true level,which made me miss the opportunity to go to my ideal university ,Shanghai University Of Finance.It is the most regret of my life.