Take high protein diet. Ask me directly for customized diet plan for you.

According to your height,your ideal body weight should be in the range of 65-69kg,so you need to gain atleast 5-7 kg weight,Which can be achieved in 5-6 months if you follow a balanced diet plan adviced by the dietitian and do weight training 3 times a week to gain muscles.R'ber weight gain is difficult as compared to weight loss but not impossible if you follow the correct plan.