The goal is fine, the process is important.
Aiming at 2kgs a month is okay. Eating natural foods to gain that weight is important. Definitely NO weight-gain medication as those will SURELY have side effects.
Go ahead.it a good schedule for your height
You did not gain 2 kg of muscle. You would prob not notice 1 kg fat gain anyway. But it still depends on what you've eaten over the day(if you don't weigh first thing in the morning.)
Anyways, your bulking and you are going to gain some fat, don't worry about it.
I think it's ok to gain 4 pounds monthly.
That's not a problem and it's OK. At 6 ft why are you only 112
pounds?
Forgot to add. My BMI currently is 15.7. I must achieve 60 kg to be "normal BMI". Any help is deeply appreciated. Thank you.