How to be a hard worker?

want can I, say now you know in my class there is a topper I want to be good at my work all sough ts of work like cooking cleaning studying etc I want to be the best in my work but when I go for it Eg. if am studying I will think that i will study properly but after 5minutes I fell tired and have to leave my work i want to do it but i can't now i have almost no capacity to work to help if work a lot i can be a topper like him pls help me out !