Originally Posted by Abid khan Achakzai

Mainly promotion is dependent on availability of seats in the district. It also depends on doing courses at right time.Mostly constable is promoted up to rank of Inspector. ASI up to rank of SP.ASP up to rank of DIG and IG.
If you are constable than pass test A1 and B1 as soon as possible it will make you eligible for promotion to H.C. After that you will go for intermediate course and than up till SI no new course. In SI you will go for upper course which will make you eligible for IP.
If you are appointed directly ASI by commission you will go for probation course of 1 year and than A,B,C,D course of 2 year.After promoting to SI you will go for upper course and then no new course .