A guy with high metabolism trying to gain weight

Hi! I am just a college guy with a high metabolism trying to gain weight and healthy mass/muscle. I am currently 5.7 ft and my weight is 55kgs trying to achieve 60kgs but my goal is 65kgs. I live in hostel and I am pretty much active person who is active in doing swimming, cycling and calisthenics beginner level. I don't know how to gain weight as whatever I try I feel my body isn't gaining anything.

I live in hostel and my course is a very high activity course which is woodworking and furniture making so basically I have lot of activity in the whole. My body type is shredded and I am lean but i need to bulk up.

So any tips or suggestions are mostly welcome!