I dont have any background in Psychology. Can i opt for it? Does it require some background info??

Also, what are the best books for both papers which would cover all course and prove more scoring?

Is this subject theoretical (needing cramming) or more like Sociology/Journalism where you can write for your own as well?

Can it be replaced with Geography? Does it also requires diagrams etc like Geography?

How much time is required to cover this? 2 weeks? Month?

Please answer.