Please begin in July for Methods. I'm serious, makes a hell of a difference.
The rest - at least a month in advance. I started 1.5 months before midyears and a month before end of years for Accounting, Chemistry and for Further, I began in July like Methods.
But for English, do consistent work - start exam style questions in July. I did this, and really improved for language analysis and Hard Times. I'm quite annoyed actually because I didn't do so well on only Context during the exam, but my school and tutor told me that this was my best section and not to do as much work for it compared to the other two. So lesson to learn is: do the essays even if you're told that you're good with them
