Today's isca paper

This time some 3-4 questions were twisted..... the rest depends on valuation.... as was last tym exam was so easy but result was too bad.

Then several places my answer content can be said correct but that does not 100 percent match with the book..,some points match few others out of understanding i wrote....,,,,zero marks kya........pura ans ditto same likhne pe hi marks milte kya. What about answer of 3a encryption, private and public key encrytion......was that to be answered as per chapter3 or 10.....i answered as per chapter 10 will i get zero. Means basic idea is same under both,,,,,,,,please bata do .....tensed