I don't think you can answer them in bahasa malaysia since english as the medium instruction has been used for 5 years consecutively.

Perhaps you should also ask, can i answer A-level examinations using bm ?
Can i answer stpm bio and chem using bm and get admitted to top universities in uk/us?

And tell you, public U in msia are going to change the medium instructions for most subjects to english in the next 2 years.