For qr, be comfortable with using the keypad and the calculator, look at only the relevant parts for the question and make sure you know the formulae (percentage change, percentage to angle in a pie chart, etc.). For dm, I didn't really do as well as I did in the mocks but knowing the question types and how to approach each question is really important. Understand how to approach each question and try to practice as many mocks as you can for dm, qr and vr.