Instructions
Select traits for your Sim that will lead to quick and easy wishes. For example, a Sim with the "Neat" trait will often receive wishes for simple tasks like "Clean the Dishes." A Sim with the "Neat" trait will clean the dishes after every meal anyway, so taking this trait and promising the wish each time your Sim eats a meal will lead to a faster accumulation of happiness points.
Select a balance of wishes that can be accomplished in the short term as well as the long term. Short-term wishes will give you an immediate boost to your happiness points, but long-term wishes will reward you with a greater number of happiness points when you accomplish them. Completing short-term wishes while working toward long-term wishes will allow you to keep up the influx of happiness points.
Remove wishes whenever necessary to make room for wishes that are easier to complete or offer more happiness points. Wishes that your Sim has not yet promised will disappear after four in-game hours. Use this as a gauge to decide which wishes to keep and which to drop by determining which wishes you can complete within that four-hour period.
Promise multiple wishes that can be completed at the same time. For example, if your Sim meets a new Sim, he may receive a wish to play a game with the new Sim and another wish to become friends with the new Sim. Since playing a game with a Sim is a social action that increases friendship between Sims, promising both wishes is an efficient strategy to earn multiple happiness points from the same action.
Select short-term wishes that help toward completing your Sim's Lifetime Wish. A Lifetime Wish is selected when you create a new adult Sim or when a teenage Sim matures into an adult. A Lifetime Wish is your Sim's overall life goal, and completing it rewards your Sim with the most happiness points at once. Therefore, if your Sim's Lifetime Wish is to reach the top of the medical career path, promise short-term wishes like "Improve Logic Skill," which will help toward accomplishing both goals.