1.Is it important to email...

1.Is it important to email to college's AOs (maybe once a week)if i want apply to their colleges?or may it be helpful? 2.Someone told me that high score sometimes is not so important,and i want to know what is real important? Just match or somrthing else. 3.Do i need to look for famous professors to write recommandations for me?And hoew many letters are suitable? The most important is that is uniqueness so vital in applying? i love business so i want make my activities get involved in it in order to show my mayor. And do activities like MUN(model united nations) and HSYLC(held by Harvard College Association for US-China Relations) useful for applying because in China so many students take work like these and it is so common to be that.