question to expect on ptdf

pls house, i studied chemical engineering and i am entering for petroleum engineering in the ptdf scholarship. Which question should i be expecting in the technical sections, is it based on chemical engineering (my course of study) or petroleum engr (course i entered for).
Your experience and advice is needed.
Thanks.

pls someone with experience should help me on what question to expect, is it on my previous course or my proposed course. plssss