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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Pursue at least one thing that matters to him... a crazy career, talent, goal, accomplishment, etc. 
Just say, what have you always wanted to try or do? 
After answer, you can say "great, let's make sure you do that before you graduate."

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Product at Popular Science and Futurism. 
Have literal skin in the game on /nonanon

The benefits are:
- He gets it out of his system i.e. gets over it.
- He might be really good and be glad he started early.
- At very least, builds that habit as you and @amitmukherjee mention.

Plus more, of course.

love it. and similar ethos to @amitmukherjee  ‘s point on a lifelong habit