Derrick Shem Wen Jun's Crush

Derrick Shem Wen Jun, a friend of mine, is acting strangly in my class. He is erm.. in love someone, I think. He keeps looking at the a girl the whole day. He is good in class, but I think his marks will drop because of her. The girl's name? I can't tell you because it is a secret of my friend! I can give you some tips, the girl is in the same class with Derrick, and her name starts with a T.