10-12 in 4 months is a large amount for a hardgainer, will take a lot of work. My biggest suggestion is to not take this as an end goal and focus less on your weight and focus more on overall health and lifestyle. Don't take it to extremes, keep things moderate so you don't overtrain and permanently injure yourself.
I was in your exact same spot when I was 19 trying to bulk up and made a few mistakes. Lifting too frequently and too much weight was the biggest one. Bodyweight exercises and yoga(esque) stretches are essential for longterm health. You'd be better off treating this like a permanent lifestyle kind of thing over a number chasing endgame as the latter often leads to injuries and psychological issues (e.g. dysmorphia). Also, exercises where you pull are much safer than exercises where you push imo. Lifting a lot of weight over your head, squatting so much that it is straining your back and benchpressing a ton aren't really healthy in my experience. Good luck.
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