Thanks a lot guys for valuable info.
I am trying to get a visa for solely sitting the test and securing another 5 points myself, too. May I ask exactly what kind of documents you submitted?
I don't know if in my motivation letter I should tell the local consulate it's about immigration, attaching my Engineers Australia assessment certification. Or just pretend I have no intentions of immigration whatsoever and I take the exam purely for "XX". I don't think it is easy to fill that "XX" part though.