Complete runs on the flats and hills; hills will help prepare you for that final run. Mix your runs with some shorter sprints at race pace while holding form.
It’s important to practise transition time and time again to avoid any unnecessary time loss. Set up an area at home and run through it until it’s second nature.
As this is an undulating course, incorporate a mixture of climbs, flats and downhills into your bike training to build up strength and get used to the switch in cadence, keeping it high when climbing. Practise being comfortable on the tri-bars and keeping control on the fast descents.
Do a short bike, get straight off and then do a short run to get used to the feeling. It’s also important to watch your pace here, so take it easy and find your rhythm.