They give lots of time for this exam because you the drawing component, so normally you will have heaps of time at the end, stay even if you finish early all the way to the end and just keep adding more to the longer response questions, repeated things you have said worded differently, my teacher was the overall senior marker for the exam for the last 15 years and said that is a really good way to leach marks out, they really just want to see you have had a good go at the question and thought about it.
Best of luck in your engineering exam and all your other exams, and best of wishes in all other future endeavours. Again sorry about the lateness!