How to study economics survey and budget from prelims perspective ?

When you are preparing for the UPSC exam then, Economics is a must subject which comes along with a survey and budget in which you should be updated through newspapers and different articles. Economic textbooks would also be very helpful in this but the current statistics of economics would always be available online. It is necessary to grab knowledge from all kinds of sources to be well prepared for economics as the present situation would be asked more. Economics is one of the major subjects of UPSC and being prepared in the best way possible in this subject would be really helpful to score points in the examination.