When studying in the final month or two, my strategy was to study for essay and calculation problems separately.
Studying for Calculation Problems
For calculation problems, I think it's best to drill the different step-by-step procedures using a study manual or notes in order to solidify how to solve all of the different types of calculation problems.
That's what I originally created the Exam 7 Cookbook to help me do.
Studying for Essay Problems
For essay problems, I drilled flashcards to memorize the details, especially in the last couple weeks.
But I don't think flashcards are enough.
Essay problems are written based on the original syllabus, so it's a huge help to be familiar with the original text.
I think many people read the syllabus once, early on, and then put it aside. The problem with this is that by exam day, you haven't read much of the actual syllabus material in a few months.
At the same time, I think re-reading the entire syllabus multiple times is wasteful, because much of the syllabus is geared towards calculation problems. Closer to the exam I think it's better to use a study manual and work problems to prepare for calculation problems.
Instead of an all-or-nothing approach, I found it helpful to re-read the sections of the syllabus that are likely to be a source of essay problems.
To help you out with this, I put together the following PDF (also on the resources page). It has a list of sections by paper that I think essay problems are most likely to be written from. Check it out and let me know if it helps!