I really hate it when students leave the questions unanswered. They will say that it's just practice now, but during exams they will do it fully. Nah, I don't believe them. If they don't do it during practice, they likely won't do it during exams too. So why won't they answer the questions?
Leaving questions blank
Tutors are not miracle workers!
I've been a full time tutor since graduation from NUS with a 1st class Honours in Civil Engineering. Never been trained formally as a full time teacher and never had tuition in my whole life, so my methods are unconventional but effective.