@LaurelGrove my son did economics A Level at a super-selective state grammar school, and this is the transition info we were sent beforehand:
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^The Undercover Economist by Tim Harford, and Freakonomics by Levitt and Dubner remain popular introductions to economics analysis but they are somewhat dated now.
Two books, both published in 2017, James Kwak’s Economism: Bad Economics and the Rise of Inequality and The Limits of the Market: The Pendulum Between Government and Market by Paul De Grauwe are short and readable.
Everybody Lies: Big Data, New Data, and What the Internet Can Tell Us About Who We Really Are by Seth Stephens-Davidowitz is an important new book which raises questions about economic research in the era of big data.
Tim Harford has published The Undercover Economist Strikes Back which covers macroeconomics.
If you would like to look into something a little more policy oriented I would suggest Nudge by Thaler and Sunstein.
Richard Thaler, Nobel Prize Winner in Economics 2017 has also written Misbehaving: The Making of Behavioral Economics.
The Big Short by Michael Lewis and his recent Flash Boys give insights into aspects of the financial system.
Economics: The User’s Guide by Ha-Joon Chang complements his 23 Things They Don’t Tell You About Capitalism.
An appeal for a new way of thinking is made in Doughnut Economics: Seven Ways to Think Like a 21st-Century Economist by Kate Raworth.
Tim Harford is an outstanding communicator and his Fifty Things That Made the Modern Economy shows the impact of invention.
On top of this, you should get into the habit of reading a quality paper. Look for articles in the main paper about the current state of the economy, especially inflation, unemployment, growth and the standard of living.
An optional but very useful extra is The Economist published weekly. You will have the opportunity to subscribe to this at a heavily subsidised rate from September.^