is the biomedical enigeering more related to bio,chem or phy

> want to know what actually the biomedical is about?
Bio means science of life. Biomedical means the medical aspect of life science.
>is it more related to bio or chem?
Yes, it is related very closely to biology, chemistry
>do i need to study some specialised subjects like:bio,chem,phy?
Yes, not just study in those subjects. You have to be very good in those course.
>what can i do in the future when i graduate from biomedical?
Biomedical will lead you to be a doctor, medical research, genetic engineering, pharmaceutical (study drugs, medicine) and many many medical specialized fields.
>is it a hard subject?
It depends on what do you classify as "hard". But this is not easy for sure. I don't think study becoming a doctor is easy.