8 kg is 17.6 pounds and that's a pretty hefty amount to lose in only a month. You'd have to lose more than 4 pounds/week, which means cutting calories too low to keep it healthy.
Far better to implement a healthy eating and exercise plan that takes longer to lose, but will bring actual lifestyle changes, so you can keep the weight off, and won't have to worry next year.
Hi, I'm sorry to ask but what would that be in lbs. ?