i believe in using a constant pace and breathing right from the
start, and having someone shout the timing for one round (if using
track) is useful. usually for the first few rounds would like to
keep around 1 min 30 s. too fast o cos no good. have someone
infront of u to chase oso good. 5th and 6th round usually tired
liao and tts where the mental comes in to tell urself its ending
soon, and u r going for the award. sprint the last 100-200 m.
tts how i got my gold. 
oh btw, the 20min break between the static stations and the 2.4 run
is not for u to rest, but to warm up for the run. make full use of
it!