Recommended reading:
Freakonomics by Steven D. Levitt and Stephen J. Dubner (2020)
Course textbook: OCR A Level Economics (4th edition) Paperback – 30 Aug. 2019 by Peter Smith - This book contents is for AS and A Level
Useful websites:
https://www.economist.com/economics-a-to-z
https://www.economicsnetwork.ac.uk/
https://www.economicshelp.org/
https://whystudyeconomics.ac.uk/
http://ww1.theworldbank.org/