Hi i am 25 years old(f), height 5'1'' and weight 43.6 kg/96lb. i need suggestion if i am right weight for my height or do i need to improve weight?

BMI questions: based on your height and weight your BMI is 18.7 placing you at the very low end of "ideal weight" http://www.nhlbi.nih.gov/health/educational/lose_wt/BMI/bmicalc.htm That being said - you are neither under or over weight. BUT at 25 and a female - you may experience issues with your menstrual cycle with this BMI hope this helps