As for your day-to-day training, the first and most important thing is to make sure that all of your planning elements are rock solid and in line on a consistent basis. If you can put together all your evidence, reasoning, and stylistic/persuasive elements in a short period of time and identify them accurately, you’ll have a far easier time writing. From there, you’ll want to make sure that your grammar, sentence structure, and transitions are in place. Utilize Anthony’s template and perfect it.
If you keep up the practice, there is no doubt that your score will come up! The essay is all about practice and timing!