I have two questions please ...i am a student 19...

is your hieght normal for your age?
the average hieght of 19 years old male is 176 cm
How to evaluate your body weight ?
you can do that by BMI which determines the appropriateness of your weight
What is BMI?
Is an indicator that has been adopted internationally to determine if the weight of the person falls within the normal limit or not, which is the body weight in kilograms divided on the length in square meters
What is the ideal weight?
Your weight is ideal if your BMI is between 18.5 and 25
What is your BMI ؟
Your BMI is around 21
What are the medications needed to gain weight?
There is no drug that increases weight directly but these drugs can be used:
    Cyprohiptadine pills to increase appetite
    Yeast pills to increase appetite
Omega 3 tablets once-twice daily
    Vitamins and supplements
What are the ways to gain weight?
Weight gain can be achieved through:
    High caloric diet
    Increase the number of meals to 6
    Dairy products
    Avocado
    Meat, Chicken, Fish
    Add cheese or butter to the meals
  Avoid excessive effort

Your height and your weight are within normal according to your age