Could I get 99 attack within 3 weeks?

You can actually do it in a few days at armoured zombies, that is if you are botting, if not then about 2 weeks I'd say.

 

use sw only if you have 55 attack to start with!!!!!

 

Yeah you could do it try playing sw

 

you could get 99 if you 24/7 sw'd

 

You can do that easily.I advise you using perfect fighter,thats what i use.