Losing 5 kg in a week doesn't seems possible and moreover it is not a healthy weight loss. You should try to lose what you can lose in a healthy manner now. Start a healthy eating plan now and avoid all type of junk food, soda, dairy products and white sugar.
As the previous comment said 5kgs is way too much in one week. But I did lose 3kg in my first week and then the second I lost 2kg but this is only what they call 'water weight'. Breakfast should either be cereal/fruit or yogurt. Lunch should be fruit/ sandwich(no Nutella)/ salad or maybe even some vegetables. Dinner should be vegetables, potato or maybe some fruit?
5 kg is way too much to lose in one week. There is no diet and workout plan that will help reach that goal.