i must study diligently

I must lock my mind first,
than i will not influence of anything.
I always just cant control myself ,
just play phone or computer.
didn't study anything.
i very regret about thing i have done,
now still got not much time
to prepare my exam .
This few day think many things ,
don't know where my heart is.
I must study hard like last time
i have done so i can get good mark.
I must stop thinking anything ,
Or not i will fail my exam,
i am not as clever as other
has good knowledge
so i must study hard.
I must up to senior 3.
I don't want to waste my parent money,
so i must do well.
I must set a target,
i set all subject for 70~80.
Set a target will get better mark,
My hopes is to get No1
so i must work more hard than other .
I set all the thing ,
i must do it ,
can't just say .
Don't care how hard is it ,
i will try to do it.