You don't.
Ok fr you seriously don't know how to revise....for RS of all subjects?
Right under each sub topic for whatever specification your doing:
-Sum it up
-Label key quotations
-Write down divergent beliefs (of the religion)
-Write down how it's important to the beliefs, how it's shown etc.
-write down divergent beliefs/attitudes towards it for e.g. say for 'abortion' write down humanist attitudes and athiest attitudes
-For topics such as these do a table full of arguments
-Key word list just in case
*You wont need to do everything here.
ez A*. All you really need is to learn key words (such as 'trinity' definition), key quotes and common sense and you have secured at least a 7.