Here is how to make a sim with 10 personality points in each type:

1. Go to Create-a-family
2. Make a sim with 0 personality points
3. Move them into a lot
4. Buy the potion making object located under -Buy Mode-Misilaneos-Knowlage
5. Keep making potions until you make a yellow potion
6. Get them to drink the yellow potion
7. Vuolla! You have a perfct 10.