First of all, you must determine your weight category and your normal weight range taking into account your age, height, and gender. Then, you can decide if you need to lose weight at all. http://bmicalc.org/ http://fatcalories.org/
You can lose 10 kilograms by doing a lot of exercises and eating right. Eat healthy items and do so more frequently. Avoid snacking often especially on foods with a lot of calories and drink plenty of water.