Yeah in 4u, and even 3u for the HSC this strategy is not great, definitely not the go in 4u haha However OP is in year 11, and even in most prelim ext1 exams this is on the whole successful, tried and tested. Everyone works in different ways at the end of the day though, just find whatever suits you best and roll with it.i actually go at medium-slow pace, even though i know i can go faster, because i make less mistakes. your strategy will pretty much fail if you do 4U maths. this is because you will rush through the first half of the paper and when you get to the hard questions you will naturally try to get the solution out, and there will be no time to check the first half, and hence you will lose marks. however this strategy has worked for many in 2U.