disappointed of myself

so so disappointed of myself....During secondary school,though i am not the top student in school but at least i still can handle my study and get A for most of the subject.I had gone through one and half year medicine student life,and the sad thing is i cant even get a satisfying result even though i put my effort on it.What wrong to me?I am not hardworking as previous?I am too weak to compete with oth top students in order to survive? Maybe i shld changed my study method?I trying nw....but it make me feel useless by trying others methods too. Maybe i shld be more hardworking than oths(maybe 100x efforts) in order to get the satisfying result i want. Pls ...pls be hardworking and study smartly,shen.