Hello dear student ,

It really depends for which college you are aiming and if it's multiple colleges then I would like to suggest you to get a copy of the syllabus of each of the college you are going to appear for . And prepare accordingly looking at the syllabus the college have provided you . Because otherwise it would be too much to prepare without syllabus . Other wise you can also go through what you have studied in economics in your bachelor's that may helps you . Because syllabus will be from your bachelor's only and not from anywhere else. I hope this helps

Thank you and best wishes