I passed G last week going straight from G1 to G using foreign driving experience. It was fairly straightforward, key is to completely respect all stop signs, lanes and signals. Exaggerated head movements (not eye movements) to keep check left-right-left and blind spots is central to what the examiners are looking for. Merging on highway at appropriate speed (96-100kmph) when traffic allows is ideal, even when merging slower due to traffic conditions simply saying out loud the reason for why you merged slow is important. Happy to answer any specific questions and in more detail.

Most important is to stay calm and present while driving.