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I like routine # 2 better, but i think you should move abs on Tuesday to shoulder day because I don't know if you will be able to do hanging leg raises after Leg workout lol.

First, get a food scale then start to learn how to track your macros by doing some research. If you can, tell your family to cook healthy foods if that possible then count your calories from there.

^
Hammer curl is the best!

My suggestion is don't do abs by itself on any particular day, do them after your main body part workout i.e. (chest, back, shoulders). Thus, consuming 2500 calories at your weight and age is not...

You can hit biceps twice a week (not counting back day since it also hit your biceps). And of course triceps do make your arms look bigger, but that's how I did it.

What can I do to improve my middle back? Which exercises should I do?

How does one get to 6-7% bodyfat?