Best if you can get someone who is well versed in acm's, SA, throttle work, angles... and duel them hours upon hours in the DA..... doing good in a 1 vs 1 is much to do about reactionary flying, knowing how to recognize angles, knowing throttle mngmnt and e mngmnt, and being soft on the stick(flying smoothly). Just find someone who is really good at dueling, and duel them as much as possible, when they beat you, try it a little different, be aggressive in going for shots and moves and keep tweaking your approach until you can beat them once, then build from there.
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Mark