Using dot points is fine unless you didn't overuse them. You definitely have to write structured sentences/paragraphs in some questions, it depends on the verb they use.
Identify, describe, discuss, outline.. these all require you to elaborate your answers, not just list them. Contrary to this, if a question requires you to use dot points, it will ask you to list your ideas.
All of the questions in the exam required sentences, except possibly Question 24, (c) which asked you to briefly describe.. you could possibly get away with nothing but dot points here. Possibly.