I definitely agree that developing skills over time is necessary for success, but English isn't all that difficult conceptually and if you're willing to put the effort in throughout the year, there's no reason you can't improve. Yes, some things like natural writing ability are incredibly difficult to learn, if not impossible in a 12/24 month period.
But if you wait a year, you will have wasted approximately 30% of your knowledge because Context/Section B is being abolished. The criteria for Sections A and C might be unchanged, but what you'll be doing in SACs throughout the year will be entirely new to you.
The VCAA website (
here) has most of the information, but it's pretty jargonistic so
here is an old thread in which some of us tried to make sense of the changes.
Play to your strengths in this situation; if you're someone who is good at oral presentations and creative pieces then the new system might suit you better. But if you like what you know and are confident with the current 3 essay-type-model then you're probably better off doing English early.
The "best way" to score highly in English is to do what the task is asking you to do. There's no cheat code I'm afraid, and everyone will study differently. Some people are writing an essay a week all year as a way of developing their understanding, others work on their ideas and knowledge in other ways and try to use practice pieces to test themselves. Work out where you are on this spectrum and study accordingly.