Oh I wasn't saying you would. I was just saying this is what happened to me.
What is your goal? Do you have the basics in term of nutrition and fitness?
What you should aim is for 1-2lb of weight loss per week, by eating healthier food, getting more actve and eating a bit less.
Realistically, by August 10, if you are careful with what you eat (aka eating enough to avoid slowing down weight loss, and eating plenty of fruit, veggies, enough protein and complex carbs while limiting junk food and soft drinks) and try to do 20-30 minutes of exercise every 2 days then almost every day, then you can probably get rid of 6kg of fat max, which is about 12lb, but half that is good too. More would probably be too fast and not be just fat.
If you eat too little, you will end up wasting muscle (the less muscle, the less you have to eat to keep trim and the less firm you'll look). You'll also get stretch marks - usually they tend to be located typically on the thighs, bottom, love handles, breasts and sometimes arms/stomach. I got some on my thighs due to losing weight too fast. Not a good look as they stay forever.
Cardio is great to shed the pounds, however to tone up/put muscle on, you need to do some resistance training, so that's crunches, push ups etc.
It might seem daunting at first, but what I usually remind myself is that it took a long time to get to a high weight/stay at a high weight, so how can I expect to get rid of it all quickly?