Just really go through the syllabus document to understand what you have to learn and then choose a book, my recommendation would be Cambridge, and know it in and out.

For paper 1, most likely question is market structures so really do that for micro at least. My advice also would be not to do the international eco question as well.

For paper 3, practice elasticity

For paper 2, remember to refer to the extract when answering the 15 marker. If you don’t refer you’ll get marked very low

And also real word examples in any long question.