The dr wants to take a lipid test every 3mo. is that normal if so what are they looking for?

Not usually: Only your doctor knows the specifics of your situation. That said, if you're treated with a statin, the 2013 American Heart Association guidelines advise that it need not be checked again as they advise against "treating to target." Perhaps your Dr is monitoring your diet - then it would be reasonable to see your progress.

Lipid checks.: The frequency of testing would really depend on your clinical situation. If you're managing your lipids by diet, exercise and weight loss then it may be acceptable to check your numbers every three months to see how you're doing. If you're on medication as well, and your dose is stable and numbers are acceptable, then checking once or twice a year may be acceptable.