With those results, business would be tough as you know yourself
since business cources are 1 of the most fought for courses
every year.
Social science i won't really say its a dumping ground but you
need to have an interest in the field since most social science
grads would work more on the community, social service sort of
jobs. It would depends on your interest to really see which social
science might be better for you. NTU open house this sat so you can
come down and learn more about them.
Biological science without bio would be pretty tough for you and
chemistry... Personally i am often asking myself why did i
choose chemistry...