I first wrote and published this as a single article. But owing to large amount of data collected afterwards, split it in to multiple sections listed below. So ORBAT of Pakistan Armed Forces is now a multi-part series with different articles for Army, Navy and Air Force. You can read Chinese Armed Forces ORBAT here
Dear sir, a brigade should be around 3000 men. This is with 3 battalions of around 900 soldiers each. While a battalion is made of around 3-4 rifle companies of around 120-200 men, there will be support elements too within the battalion.
Thanks for correction. Missed a few things there. Are you sure about upto 200 men in a mechanised company?