how can my younger brother who is a junior in high school start preparing for the real world?

plz don’t say SAT prep

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My son told me his plan is to play in the NBA in his 20-30s, start a sapphire mine in his 40s, and then do animal conservation in his 50s. I remember in high school being told I needed to specialize / find 1 career. Encourage your brother to try many things