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Ocr economics help

Hello all,
I am on the last unit F585 for the A level course and the exam is fast approaching. However I am really struggling on how to revise for this unit. The pre release is on Estonia and sustainable development.

Any past students who did this exam board, How did you revise, did you focus more on the textbook and theory or on the pre release.

Any advice, Please?

Thank You in advance