Terming the changes as "half-baked reforms", she urged Prime Minister Manmohan Singh to reconsider the nod given by the government to UPSC and insisted the "existing pattern be retained".
In a letter to Singh, she also requested him to direct the Union Public Service Commission (UPSC) not to proceed further with the preparatory work for such a common examination, as per the recommendations of the Second Administrative Reforms Commission.
Such an exercise would only demotivate state service officers and would also result in these officers focusing more on examination preparation rather than on performing their official duties, she said.
"Such a mode of recruitment would also upset the existing administrative seniority and hierarchy and the state specific reservation pattern", Jayalalithaa pointed out.
She opposed the reduction of age limit for eligibility for induction into the IAS from 54 years to 40 and said this "retrograde" recommendation would badly undermine the aspiration of officers who have served the state with dedication in the expectation of promotion or selection to IAS.