To lower your cholesterol and have a better HDL/LDL ratio, you should:
-avoid saturated fats (i.e. fried food, animal fats, dairy fats, reg. mayo etc.)
-eat foods rich in EFAs such as, fatty fish (salmon, mackerel etc.), avocados, flax oil, olive oil, nuts (almonds, walnuts)
-try some CLA supplement
-eat a diet rich in fibre (oatmeal, vegetables, fruits, psyllium husks etc.)
-have a glass of red wine a few times a week
-eat unrefined foods such as complex carbs. High GI carbs have shown to negatively affect chol. levels.
Hope that helped