Yes, he can improve his height.
Growth is one of the important characteristics in human being. We grow to certain height for certain period only. This change takes place in adolescence at maximum pace.
An individual reaches his/ her maximum height during adolescence period only.
So in adolescence period(10-18 years) swaroop should eat balance diet and should play outdoor activites. Swimming is the best way to grow. Proteins, calcium intake and vitamin D can also increase his height.
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Years old SwaroopAP - Biology