You guys dont have to cheat. I got sonething perfect for you and it will give you lots of XP, simoleons and lifepoint
I got a perfect way guys you are gonna love it (no cheat needed) cooking hobby is the fastest way if you are around level 9 or so! Buy around 4 stoves and have all sims cook cheese and tomatoe on toast (1 min) if you have already completed the hobby quest and all sims are at lvl 6 at the cooking hobby, just reset the hobby cooking hobby collection and keep making the one recipe with all sims! You will find all collection in around 10 minutes ;p this is what you get in total: 13,250 XP, 4,765 simoleons, and 5LP everytime you finish the collection in around ten mins or more. I started at lvl 9 and im now at lvl 14, with 90 LPs, and 50,000 simoleons! All fast guys just keep resetting the cooking hobby collection when done! The minute passes so fast, i usually just collect avenue money while waiting! ;p