In the library, in the library, or in the library. Freshman, because math is not good, and I didn't listen to several advanced math classes carefully, so now advanced math is so bad. Especially differential, integral and calculus. Recently, I usually go straight to the library after dinner at around six o'clock and don't leave until closing time. Alas, I still don't quite understand, so I must listen carefully in class. Math must not be bad, or I will make up for it.