You need a bookcase. From that, they can study mechanical, as well as cooking and cleaning. They can also try repairing broken things, and tinkering, to improve this skill. With Free Time, they can even buy a wreck of a car to work on.
Skills for what? There's mechanical, creativity, cooking, charisma, logic, and body.
Cooking, Fishing, Mechanical and Gardening Skill
You have to find them at certain areas at certain parts of the day.
possible places of mechanical skills in the managers suit hotel reactor at the back of the stairs at the basement near the basement in the atrium and in the casino
Buy a bookcase, the click on it and choose "Study", then "Mechanical". Or just simply fix things around the house.
No, there is no cheat code for skills on The Sims 3.
you hide it in the managers room, where the control panel is.
Go to the bookshelf, and click "Study" then "Mechanical"
Buy a bookshelf click on it, click the "study" option and then mechanical.
Unfortunately there is no Sims 3 cheat that maximises all skills...yet.
There are no real cheats for The Sims Makin' Magic. However, you can still use rosebud for simoleons, and move_objects on for picking up the Sim, deleting the Sim, thereby bringing the Sim back completely refreshed. (Save before you delete. Loss of newly-built skills is a tragic possibility.) If, however, your Sims have high Mechanical, Logic, and Cooking skills, they can earn more Magicoins than other Sims by dueling, performing, and experimenting.
Go to this link. In that walkthrough it will show all the times and places for ALL the skillpoints. http://faqs.ign.com/articles/663/663448p1.html