The best way to lose 30 pounds in 3 months is to follow some diet program by your doctor (nutritionist), a lot of workout and you need strong will. try this http://goo.gl/eThZj2 , i lose more than 30 pounds following this guide. good luck
You first of all need to believe that you can do it. Then drink excess water (water makes you eat less and is good for your health), eat more foods with fiber, and introduce exercise to your daily activities (something simply like a 45 minute walk). One common mistake in losing weight is the omission of meals. Without consistency of meals, the body will thinks it's starving and unfortunately, everything it takes in, will be stored as fat as an energy source later. Check out http://www.lose30pounds.org/in30days.html for more tips.
I have a good diet, you lose like 1-4 pounds a day! but you have to stick to it exactly and do a little exercise like just walk for 30 minutes to 1 hour everyday. Breakfast: apple and drink 1 cup of milk. lunch: 1 brown bread and 1 spoon of labneh (cream cheese) dinner: grilled chicken or steak. and drink a lot of green tea while your at it! green tea cleans your stomach and helps you get thinner! i lost like 7 kilograms in 3 weeks or so.
HOW TO DO IT: I am a Mom and after the birth of my second child I needed to lose over 100 pounds, the secret was reversing INFLAMMATORY FAT, my nutritionist showed me how to reverse this... 30 pounds will be gone in a month or so, if you follow the plan, it works and it is healthy