Economy may be daunting to some, but the questions are based on your conceptual understanding of macroeconomics. No matter how many times you read and mug-up the data, you are bound to falter in the exam. Conceptual clarity is what matters the most in Economics.
On an average around 14-15% weightage is given to Economics.
If your basic funda’s of Economics is sound, then you will even be able to get all answers right in Prelims . So our sincere advice to you is to invest more time in understanding the concepts and analyzing how one concept is linked to another.