It’s all about accuracy! Get with your S&TA and tell him/her about your goal, and start working towards your accuracy jumps.
Start logging them right away, and, landing area size and traffic permitting, you might be able to get those accuracy jumps done while doing instructional jumps or shooting camera. Make sure you talk to your S&TA and head instructor, to make sure that you pick the correct spot to land, far away from all other traffic, if you wish to do your accuracy jumps in normal high-altitude jump runs.
The other thing to do is to serve as ground crew in as many demos as you can. You need just one to get the rating, but the more you do, the better idea you’ll have of how a demo actually works.