it is not very possible.
most schools requires students to offer h2 chemistry as a
pre-requisite to study biology.
and bio and phy is a lousy combination if you are planning to
get into sci/eng degree courses.
most of the science courses require chemistry, with the
exception of physics degree.
for engineering, biology is close to useless, with the core
subject requirements being chemistry and physics.
with bio and physics, you can only consider for engineering
courses such as mech, electrical, and civil engineering.
so if you are planning to get into a bio-related career,
chemistry is a must.