Start with books that give you a disciplined route into each branch: Think: A Compelling Introduction to Philosophy by Simon Blackburn, An Introduction to Political Philosophy by Jonathan Wolff, The Undercover Economist by Tim Harford, Justice: What's the Right Thing to Do? by Michael J. Sandel, The Logic Manual by Volker Halbach.
Episode 01: The Moral Side of Murder, and Intro to Economics: Crash Course Econ #1.
For listening, More or Less: Behind the Stats, Philosophy Bites, Freakonomics Radio, The Inquiry can help you test how arguments, evidence and statistics are handled in public discussion.
For structured study, Principles of Economics: Microeconomics, Principles of Economics: Macroeconomics, Principles of Microeconomics, Introducing philosophy, What Is Economics? offer introductions to microeconomics, macroeconomics, philosophy and economic method.
We recommend keeping a reading log with three columns: claim, evidence, objection. That habit transfers directly into TARA writing, interview discussion and first-year tutorial preparation.