Normally, it is Executive Decision, taken by government to notify required number of posts for govt jobs.
Normally, Court cannot sit on appeal over such decisions to see if posts should be more advertised or not.
But in case of Nihal Singh, reported in 2013(14) SCC 65, decided on 7.8.13, Supreme Court asserted that Constitutional Courts are not prevented from examining such decisions.
It means, all High Courts and Supreme Court can examine such decisions if so required in the interest of justice.
Haresh Raichura
11/6/2014