This is a very broad question, so I think 2 parts of the depth study should be fine. Prehaps just doing all 3 will keep you on the safe side.
I have managed to do all the 2015-11 5 markers - now i just have read them, over and over again.
For section 2 - Should I do the same for the short answers? Or shoud i just do 1 past paper question? (I feel like the short answer for Islam are going to be all the same).
As for the essay, im having trouble finding 'quotes' from my notes to memorise. Should I pick information from each section? Im just overall confused...
For Section 2 just make sure you know:
The ethical teachings and their impact of the lives of adherents. (I would say know 3 different types)
How to describe your practice, how it reflects the principal beliefs and how it is important for the individual and community.
How your significant individual contributed to the development and expression of your religion.
If you know this you should be sweet.
For your essay - you had plenty of quotes, if you are confused I would suggest thinking of how you would use them in an argument. So, group your quotes into Ethics, Practice and Significant figure obviously. From there, group them into specific ethics, individual/community significance for practice (most will be individual) and into the different ways your significant figure contributed to the religion (eg. for Paul I would group my quotes according to Justification by Faith, his contribution to the Early Church, his teachings on the importance of love etc.) And then finally have some quotes for a broader question focusing on the principal beliefs of your religion eg. Christianity = salvation, revelation, death and resurrection of christ etc.