There is more emphasis on SAT than A level results. I believe
that you should wait for your A level results,then make a
consideration.Never know whether you can do well for both Gp,as
well as mathematics.
Based on my perspectives,Social science is a part of the liberal
arts curriculum. The liberal arts curriculum comprises social
science, humanities, math, science, and so forth. Examples of
social science include psychology, sociology, anthropology, and
economics. Success at social science requires some skill with
statistics and quantitative data. You should be good at identifying
cause and effect, especially when it is indirect. You should also
be free of prejudice and have an open mind. In general, social
scientists study people and their behavior.
*The term liberal arts is more general and includes such subjects
as literature (and writing), history, philosophy, religion, math,
music and art, and all the sciences. Typically liberal arts does
not include nursing and health sciences, business, and highly
specialized and/or technical fields.
social science might be the more versatile option, because you
can prepare for a career (like a psychologist) related to a social
science (like psychology), if you decide teaching isnt for you.
As a whole,social science is specific(small details),while
liberal arts is broader and covers the big picture.
Glad to know that you took SAT in preparation for Yale-Nus
application,may your passion take you to your goals