I don't know what to do

Everyone seems pretty serious with studies, and getting good marks in tests and exams
As for me... i have no motivation to study... i want to study for my self and like actually get good marks but, i just have no motivation.
just after 30 mins of studying i get bored and don't want to study anymore.
I wanted to get 95% on boards thinking that i'll study more and work harder, but i just can't... now i don't even thing i could get 80% on boards... i seriously don't know what to do now