Buy 'Islamic Studies' book of Caravan Publishers, written by Hafiz Karimdad CHughtai. This book was very helpful for me in ce-2016, I went through it vaguely and secured 63. The best thing about it is the answers are given in logical sequence.
In ce-2017 only syllabus was not followed unlike ce-2016, past papers and current relevant issues should also be prepared. Hope this helps.