last stubborn kgs

Bitcheslovecake

I've lost about 7-8 kilos since last may.Now i weight 57 kgs and according to most of bmi calculator i'm in a good shape but i would like to loose at least 3-4 kgs ,my last to erase totally a little bit of fat that i've got stuck on my tummy.I still have plenty of time till summer but i would really appreciate advices