If you need to be below a magical 30 bmi then you have three weeks to lose 4kgs. For your height 104 gives just under 30. If you want EK badly then a crash diet might be worth it. My dealings with officialdom over the years suggests avoiding a limit is better than being over it and having to fight the system. When I lose weight on a protein diet (Atkins, Ducan ) then 1.5 Kgs comes off straight away as less water retention, then the weight reduces another 1.5 kg a week. When you finish the diet the water will return so factor that in.