Knowledge of mechanics can open the door to many types of skilled employment!  This book can get you started. 
basic mechanics book
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Table of Contents
Score higher on Mechanical Aptitude Tests.  Learn all about basic mechanics and all the mechanical parts and tools.  Gears, cams, levers, pulleys, springs and clips; they're all here in this book.  Five chapters on mechanics plus an Appendix  covering Basic Math to help you out at school.  237 pgs.  Written by Joe Jacobs, a former maintenance technician for the US Postal Service; he has worked on everything from conveyor belts to computer networks.
at school and on aptitude tests!
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How Gears Work - pdf
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Get Started With Mechanics book - cams and belts
Get Started With Mechanics book - rings and clips
Get Started With Mechanics book - wrenches and tools
Basic Mechanics Book
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Basic Mechanics Book
Hard cover
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