L.l.b. after ca is a good option???

No Dear..........I dont think so that LLB is good after Ca............Bcoz U can do practice only in one both of them.......

one practice criteria applicable in other fields also like cs cwa..

Yes after LLB you can fight  at any level like IT AT Tribunal ,High Court or Supreme Court etc.

Your LLB should be from repute University like Delhi University etc it will fetch good reputation,Otherwise LLB from any other university which is not so reputed just give u only qualification not knowldege or repo.