if you want to save time then in the first titration attempt spend a little more time and measure exactly. Then just put a little higher value for rough titration and for accurate titrations 0.5 cm^3 up or down from exact. E.g If you get 23.5 first time then in rough you could use the value 24.2 and then in 1 st 2nd accurate titration you can write 23.50 and 23.00. Thats what I did today and still missed around 5 marks :/