exemption

fetch 60 marks..

is it that i should score above 30 or 40 in other papers.......

no there is no relation with other subjects ..just for eg  see this link

https://www.caresults.nic.in/pce/pce.asp

oops sry that link is not accurate 

At least a score of 60 in a subject to be exempted from it.

Condition will be same, 40 each, and 50 aggregate.Either of condition not fulfilled, group gone.But a score of 60 or more in one or more , will be exempted for ur next attempt.